node_modules

author: Florian Dold <florian.dold@gmail.com> 2017-05-03 15:35:00 +0200
committer: Florian Dold <florian.dold@gmail.com> 2017-05-03 15:35:00 +0200
commit: de98e0b232509d5f40c135d540a70e415272ff85 (patch)
tree: a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/clean-css
parent: e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff)
download: wallet-core-de98e0b232509d5f40c135d540a70e415272ff85.tar.xz
96 files changed, 11242 insertions, 0 deletions
diff --git a/node_modules/clean-css/History.md b/node_modules/clean-css/History.md
new file mode 100644
index 000000000..3cf6682ef
--- /dev/null
+++ b/node_modules/clean-css/History.md
@@ -0,0 +1,1240 @@
+[4.0.12 / 2017-04-12](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.11...v4.0.12)
+==================
+
+* Fixed issue [#930](https://github.com/jakubpawlowicz/clean-css/issues/930) - regression in tidying selectors.
+
+[4.0.11 / 2017-04-04](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.10...v4.0.11)
+==================
+
+* Fixed issue [#924](https://github.com/jakubpawlowicz/clean-css/issues/924) - `hsl` zero percent eager optimization.
+
+[4.0.10 / 2017-03-22](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.9...v4.0.10)
+==================
+
+* Fixed issue [#917](https://github.com/jakubpawlowicz/clean-css/issues/917) - prevents grid area unquoting.
+* Backported [#916](https://github.com/jakubpawlowicz/clean-css/issues/916) - maximum number of merged selectors.
+* Refixed issue [#556](https://github.com/jakubpawlowicz/clean-css/issues/917) - IE backslash hacks.
+
+[4.0.9 / 2017-03-15](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.8...v4.0.9)
+==================
+
+* Fixed issue [#902](https://github.com/jakubpawlowicz/clean-css/issues/902) - case insensitive attribute matchers.
+* Fixed issue [#903](https://github.com/jakubpawlowicz/clean-css/issues/903) - web UI and source maps.
+* Fixed issue [#907](https://github.com/jakubpawlowicz/clean-css/issues/907) - space after closing brace in `@supports`.
+* Fixed issue [#910](https://github.com/jakubpawlowicz/clean-css/issues/910) - too aggressive precision optimizations.
+
+[4.0.8 / 2017-02-22](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.7...v4.0.8)
+==================
+
+* Fixes edge case in remote stylesheet fetching.
+* Fixed issue [#899](https://github.com/jakubpawlowicz/clean-css/issues/899) - regression in optimizing pseudo class arguments.
+
+[4.0.7 / 2017-02-14](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.6...v4.0.7)
+==================
+
+* Fixed issue [#891](https://github.com/jakubpawlowicz/clean-css/issues/891) - merging vendor-prefixed pseudo-classes.
+
+[4.0.6 / 2017-02-10](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.5...v4.0.6)
+==================
+
+* Fixed issue [#885](https://github.com/jakubpawlowicz/clean-css/issues/885) - unquoting `font-feature-settings`.
+
+[4.0.5 / 2017-02-07](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.4...v4.0.5)
+==================
+
+* Fixed issue [#884](https://github.com/jakubpawlowicz/clean-css/issues/884) - handling absolute paths on Windows.
+* Fixed issue [#881](https://github.com/jakubpawlowicz/clean-css/issues/881) - incorrect `require` arity.
+* Fixed issue [#880](https://github.com/jakubpawlowicz/clean-css/issues/880) - incorrect token type identification.
+
+[4.0.4 / 2017-02-04](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.3...v4.0.4)
+==================
+
+* Fixed issue [#879](https://github.com/jakubpawlowicz/clean-css/issues/879) - incorrect handling of spaces in paths.
+* Fixed issue [#878](https://github.com/jakubpawlowicz/clean-css/issues/878) - invalid double backslash tokenization.
+
+[4.0.3 / 2017-01-30](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.2...v4.0.3)
+==================
+
+* Fixed issue [#875](https://github.com/jakubpawlowicz/clean-css/issues/875) - invalid traversing in semanting merging.
+
+[4.0.2 / 2017-01-26](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.1...v4.0.2)
+==================
+
+* Fixed issue [#874](https://github.com/jakubpawlowicz/clean-css/issues/874) - regression in at-rule tokenization.
+
+[4.0.1 / 2017-01-25](https://github.com/jakubpawlowicz/clean-css/compare/v4.0.0...v4.0.1)
+==================
+
+* Fixed issue [#866](https://github.com/jakubpawlowicz/clean-css/issues/866) - edge case in `inline` option.
+* Fixed issue [#867](https://github.com/jakubpawlowicz/clean-css/issues/867) - skip optimizing variable values.
+* Fixed issue [#868](https://github.com/jakubpawlowicz/clean-css/issues/868) - accept absolute paths in input hash.
+* Fixed issue [#872](https://github.com/jakubpawlowicz/clean-css/issues/872) - edge case in CSS tokenization.
+
+[4.0.0 / 2017-01-23](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.24...v4.0.0)
+==================
+
+* Adds more detailed error & warning messages on top of the new tokenizer.
+* Disables restructuring optimizations by default until optimized in #533.
+* Fixes a bug ignoring incorrect properties in complex restructuring.
+* Requires Node.js 4.0+ to run.
+* Removes `benchmark` API option as total time is always reported under `stats` property.
+* Removes `debug` API switch as stats are always gathered and available under `stats` property.
+* Replaces the old tokenizer with a new one which doesn't use any escaping.
+* Replaces the old `@import` inlining with one on top of the new tokenizer.
+* Re-enables `background-(clip|origin|size)` merging with `background` shorthand.
+* Simplifies URL rebasing with a single `rebaseTo` option in API or inferred from `--output` in CLI.
+* Splits `inliner` option into `inlineRequest` and `inlineTimeout`.
+* Fixed issue [#209](https://github.com/jakubpawlowicz/clean-css/issues/209) - adds output formatting via `format` flag.
+* Fixed issue [#290](https://github.com/jakubpawlowicz/clean-css/issues/290) - removes aggressive merging.
+* Fixed issue [#432](https://github.com/jakubpawlowicz/clean-css/issues/432) - adds URLs normalization.
+* Fixed issue [#460](https://github.com/jakubpawlowicz/clean-css/issues/460) - unescaped semicolon in selector.
+* Fixed issue [#657](https://github.com/jakubpawlowicz/clean-css/issues/657) - adds property name validation.
+* Fixed issue [#685](https://github.com/jakubpawlowicz/clean-css/issues/685) - adds lowercasing hex colors optimization.
+* Fixed issue [#686](https://github.com/jakubpawlowicz/clean-css/issues/686) - adds rounding precision for all units.
+* Fixed issue [#703](https://github.com/jakubpawlowicz/clean-css/issues/703) - changes default IE compatibility to 10+.
+* Fixed issue [#731](https://github.com/jakubpawlowicz/clean-css/issues/731) - adds granular control over level 2 optimizations.
+* Fixed issue [#739](https://github.com/jakubpawlowicz/clean-css/issues/739) - error when a closing brace is missing.
+* Fixed issue [#750](https://github.com/jakubpawlowicz/clean-css/issues/750) - allows `width` overriding.
+* Fixed issue [#756](https://github.com/jakubpawlowicz/clean-css/issues/756) - adds disabling font-weight optimizations.
+* Fixed issue [#758](https://github.com/jakubpawlowicz/clean-css/issues/758) - ignores rules with empty selector.
+* Fixed issue [#767](https://github.com/jakubpawlowicz/clean-css/issues/767) - disables remote `@import` inlining by default.
+* Fixed issue [#773](https://github.com/jakubpawlowicz/clean-css/issues/773) - adds reordering based on selector specificity.
+* Fixed issue [#785](https://github.com/jakubpawlowicz/clean-css/issues/785) - adds `@font-face` de-duplication.
+* Fixed issue [#791](https://github.com/jakubpawlowicz/clean-css/issues/791) - resolves imports in-memory if possible.
+* Fixed issue [#796](https://github.com/jakubpawlowicz/clean-css/issues/796) - semantic merging for `@media` blocks.
+* Fixed issue [#801](https://github.com/jakubpawlowicz/clean-css/issues/801) - smarter `@import` inlining.
+* Fixed issue [#806](https://github.com/jakubpawlowicz/clean-css/issues/806) - skip optimizing variable properties.
+* Fixed issue [#817](https://github.com/jakubpawlowicz/clean-css/issues/817) - makes `off` disable rounding.
+* Fixed issue [#818](https://github.com/jakubpawlowicz/clean-css/issues/818) - disables `px` rounding by default.
+* Fixed issue [#828](https://github.com/jakubpawlowicz/clean-css/issues/828) - `-chrome-` hack support.
+* Fixed issue [#829](https://github.com/jakubpawlowicz/clean-css/issues/829) - adds more strict selector merging rules.
+* Fixed issue [#834](https://github.com/jakubpawlowicz/clean-css/issues/834) - adds extra line break in nested blocks.
+* Fixed issue [#836](https://github.com/jakubpawlowicz/clean-css/issues/836) - enables level `0` optimizations.
+* Fixed issue [#839](https://github.com/jakubpawlowicz/clean-css/issues/839) - allows URIs in import inlining rules.
+* Fixed issue [#840](https://github.com/jakubpawlowicz/clean-css/issues/840) - allows input source map as map object.
+* Fixed issue [#843](https://github.com/jakubpawlowicz/clean-css/issues/843) - regression in selector handling.
+* Fixed issue [#845](https://github.com/jakubpawlowicz/clean-css/issues/845) - web compatibility of 4.0 branch.
+* Fixed issue [#847](https://github.com/jakubpawlowicz/clean-css/issues/847) - regression in handling invalid selectors.
+* Fixed issue [#849](https://github.com/jakubpawlowicz/clean-css/issues/849) - disables inlining protocol-less resources.
+* Fixed issue [#856](https://github.com/jakubpawlowicz/clean-css/issues/856) - allows `minify` to return a promise.
+* Fixed issue [#857](https://github.com/jakubpawlowicz/clean-css/issues/857) - normalizes CleanCSS API interface.
+* Fixed issue [#863](https://github.com/jakubpawlowicz/clean-css/issues/863) - adds `transform` callback for custom optimizations.
+
+[3.4.24 / 2017-01-20](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.23...v3.4.24)
+==================
+
+* Fixed issue [#859](https://github.com/jakubpawlowicz/clean-css/issues/859) - avoid `-webkit-border-radius` optimizations.
+
+[3.4.23 / 2016-12-17](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.22...v3.4.23)
+==================
+
+* Fixed issue [#844](https://github.com/jakubpawlowicz/clean-css/issues/844) - regression in property values extraction.
+
+[3.4.22 / 2016-12-12](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.21...v3.4.22)
+==================
+
+* Fixed issue [#841](https://github.com/jakubpawlowicz/clean-css/issues/841) - disabled importing and files passed as array.
+* Ignores `@import` at-rules if appearing after any non-`@import` rules.
+
+[3.4.21 / 2016-11-16](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.20...v3.4.21)
+==================
+
+* Fixed issue [#821](https://github.com/jakubpawlowicz/clean-css/issues/821) - reducing non-adjacent rules.
+* Fixed issue [#830](https://github.com/jakubpawlowicz/clean-css/issues/830) - reordering border-* properties.
+* Fixed issue [#833](https://github.com/jakubpawlowicz/clean-css/issues/833) - moving `@media` queries.
+
+[3.4.20 / 2016-09-26](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.19...v3.4.20)
+==================
+
+* Fixed issue [#814](https://github.com/jakubpawlowicz/clean-css/issues/814) - `:selection` rule merging.
+
+[3.4.19 / 2016-07-25](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.18...v3.4.19)
+==================
+
+* Fixed issue [#795](https://github.com/jakubpawlowicz/clean-css/issues/795) - `!important` and override compacting.
+
+[3.4.18 / 2016-06-15](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.17...v3.4.18)
+==================
+
+* Fixed issue [#787](https://github.com/jakubpawlowicz/clean-css/issues/787) - regression in processing data URIs.
+
+[3.4.17 / 2016-06-04](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.16...v3.4.17)
+==================
+
+* Fixed issue [#783](https://github.com/jakubpawlowicz/clean-css/issues/783) - regression in processing data URIs.
+
+[3.4.16 / 2016-06-02](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.15...v3.4.16)
+==================
+
+* Fixed issue [#781](https://github.com/jakubpawlowicz/clean-css/issues/781) - regression in override compacting.
+* Fixed issue [#782](https://github.com/jakubpawlowicz/clean-css/issues/782) - regression in processing data URIs.
+
+[3.4.15 / 2016-06-01](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.14...v3.4.15)
+==================
+
+* Fixed issue [#776](https://github.com/jakubpawlowicz/clean-css/issues/776) - edge case in quoted data URIs.
+* Fixed issue [#779](https://github.com/jakubpawlowicz/clean-css/issues/779) - merging `background-(position|size)`.
+* Fixed issue [#780](https://github.com/jakubpawlowicz/clean-css/issues/780) - space after inlined variables.
+
+[3.4.14 / 2016-05-31](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.13...v3.4.14)
+==================
+
+* Fixed issue [#751](https://github.com/jakubpawlowicz/clean-css/issues/751) - stringifying CSS variables.
+* Fixed issue [#763](https://github.com/jakubpawlowicz/clean-css/issues/763) - data URI SVG and quoting.
+* Fixed issue [#765](https://github.com/jakubpawlowicz/clean-css/issues/765) - two values of border-radius.
+* Fixed issue [#768](https://github.com/jakubpawlowicz/clean-css/issues/768) - invalid border-radius property.
+
+[3.4.13 / 2016-05-23](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.12...v3.4.13)
+==================
+
+* Fixed issue [#734](https://github.com/jakubpawlowicz/clean-css/issues/769) - Node.js 6.x support.
+
+[3.4.12 / 2016-04-09](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.11...v3.4.12)
+==================
+
+* Fixed issue [#734](https://github.com/jakubpawlowicz/clean-css/issues/734) - `--root` option edge case.
+* Fixed issue [#758](https://github.com/jakubpawlowicz/clean-css/issues/758) - treats empty rule as unmergeable.
+
+[3.4.11 / 2016-04-01](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.10...v3.4.11)
+==================
+
+* Fixed issue [#738](https://github.com/jakubpawlowicz/clean-css/issues/738) - edge case in comment processing.
+* Fixed issue [#741](https://github.com/jakubpawlowicz/clean-css/issues/741) - HTTP proxy with HTTPS inlining.
+* Fixed issue [#743](https://github.com/jakubpawlowicz/clean-css/issues/743) - background shorthand and source maps.
+* Fixed issue [#745](https://github.com/jakubpawlowicz/clean-css/issues/745) - matching mixed case `!important`.
+
+[3.4.10 / 2016-02-29](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.9...v3.4.10)
+==================
+
+* Fixed issue [#735](https://github.com/jakubpawlowicz/clean-css/issues/735) - whitespace removal with escaped chars.
+
+[3.4.9 / 2016-01-03](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.8...v3.4.9)
+==================
+
+* Sped up merging by body advanced optimization.
+* Fixed issue [#693](https://github.com/jakubpawlowicz/clean-css/issues/693) - restructuring edge case.
+* Fixed issue [#711](https://github.com/jakubpawlowicz/clean-css/issues/711) - border fuzzy matching.
+* Fixed issue [#714](https://github.com/jakubpawlowicz/clean-css/issues/714) - stringifying property level at rules.
+* Fixed issue [#715](https://github.com/jakubpawlowicz/clean-css/issues/715) - stack too deep in comment scan.
+
+[3.4.8 / 2015-11-13](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.7...v3.4.8)
+==================
+
+* Fixed issue [#676](https://github.com/jakubpawlowicz/clean-css/issues/676) - fuzzy matching unqoted data URIs.
+
+[3.4.7 / 2015-11-10](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.6...v3.4.7)
+==================
+
+* Fixed issue [#692](https://github.com/jakubpawlowicz/clean-css/issues/692) - edge case in URL quoting.
+* Fixed issue [#695](https://github.com/jakubpawlowicz/clean-css/issues/695) - shorthand overriding edge case.
+* Fixed issue [#699](https://github.com/jakubpawlowicz/clean-css/issues/699) - IE9 transparent hack.
+* Fixed issue [#701](https://github.com/jakubpawlowicz/clean-css/issues/701) - `url` quoting with hash arguments.
+
+[3.4.6 / 2015-10-14](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.5...v3.4.6)
+==================
+
+* Fixed issue [#679](https://github.com/jakubpawlowicz/clean-css/issues/679) - wrong rebasing of remote URLs.
+
+[3.4.5 / 2015-09-28](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.4...v3.4.5)
+==================
+
+* Fixed issue [#681](https://github.com/jakubpawlowicz/clean-css/issues/681) - property inheritance & restructuring.
+* Fixed issue [#675](https://github.com/jakubpawlowicz/clean-css/issues/675) - overriding with `!important`.
+
+[3.4.4 / 2015-09-21](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.3...v3.4.4)
+==================
+
+* Fixed issue [#626](https://github.com/jakubpawlowicz/clean-css/issues/626) - edge case in import rebasing.
+* Fixed issue [#674](https://github.com/jakubpawlowicz/clean-css/issues/674) - adjacent merging order.
+
+[3.4.3 / 2015-09-15](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.2...v3.4.3)
+==================
+
+* Fixed issue [#668](https://github.com/jakubpawlowicz/clean-css/issues/668) - node v4 path.join.
+* Fixed issue [#669](https://github.com/jakubpawlowicz/clean-css/issues/669) - adjacent overriding with `!important`.
+
+[3.4.2 / 2015-09-14](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.1...v3.4.2)
+==================
+
+* Fixed issue [#598](https://github.com/jakubpawlowicz/clean-css/issues/598) - restructuring border properties.
+* Fixed issue [#654](https://github.com/jakubpawlowicz/clean-css/issues/654) - disables length optimizations.
+* Fixed issue [#655](https://github.com/jakubpawlowicz/clean-css/issues/655) - shorthands override merging.
+* Fixed issue [#660](https://github.com/jakubpawlowicz/clean-css/issues/660) - !important token overriding.
+* Fixed issue [#662](https://github.com/jakubpawlowicz/clean-css/issues/662) - !important selector reducing.
+* Fixed issue [#667](https://github.com/jakubpawlowicz/clean-css/issues/667) - rebasing remote URLs.
+
+[3.4.1 / 2015-08-27](https://github.com/jakubpawlowicz/clean-css/compare/v3.4.0...v3.4.1)
+==================
+
+* Fixed issue [#652](https://github.com/jakubpawlowicz/clean-css/issues/652) - order of restoring and removing tokens.
+
+[3.4.0 / 2015-08-27](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.10...v3.4.0)
+==================
+
+* Adds an option for a fine-grained `@import` control.
+* Adds unit compatibility switches to disable length optimizations.
+* Adds inferring proxy settings from HTTP_PROXY environment variable.
+* Adds support for Polymer / Web Components special selectors.
+* Adds support for Polymer mixins.
+* Adds testing source maps in batch mode.
+* Unifies wrappers for simple & advanced optimizations.
+* Fixed issue [#596](https://github.com/jakubpawlowicz/clean-css/issues/596) - support for !ie IE<8 hack.
+* Fixed issue [#599](https://github.com/jakubpawlowicz/clean-css/issues/599) - support for inlined source maps.
+* Fixed issue [#607](https://github.com/jakubpawlowicz/clean-css/issues/607) - adds better rule reordering.
+* Fixed issue [#612](https://github.com/jakubpawlowicz/clean-css/issues/612) - adds HTTP proxy support.
+* Fixed issue [#618](https://github.com/jakubpawlowicz/clean-css/issues/618) - adds safer function validation.
+* Fixed issue [#625](https://github.com/jakubpawlowicz/clean-css/issues/625) - adds length unit optimizations.
+* Fixed issue [#632](https://github.com/jakubpawlowicz/clean-css/issues/632) - adds disabling remote `import`s.
+* Fixed issue [#635](https://github.com/jakubpawlowicz/clean-css/issues/635) - adds safer `0%` optimizations.
+* Fixed issue [#644](https://github.com/jakubpawlowicz/clean-css/issues/644) - adds time unit optimizations.
+* Fixed issue [#645](https://github.com/jakubpawlowicz/clean-css/issues/645) - adds bottom to top `media` merging.
+* Fixed issue [#648](https://github.com/jakubpawlowicz/clean-css/issues/648) - adds property level at-rule support.
+
+[3.3.10 / 2015-08-27](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.9...v3.3.10)
+==================
+
+* Adds better comments + keepBreaks handling.
+* Adds better text normalizing in source maps mode.
+* Fixes non-adjacent optimizations for source maps.
+* Fixes removing unused items.
+* Improves `outline` break up with source maps.
+* Refixed issue [#629](https://github.com/jakubpawlowicz/clean-css/issues/629) - source maps & background shorthands.
+
+[3.3.9 / 2015-08-09](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.8...v3.3.9)
+==================
+
+* Fixed issue [#640](https://github.com/jakubpawlowicz/clean-css/issues/640) - URI processing regression.
+
+[3.3.8 / 2015-08-06](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.7...v3.3.8)
+==================
+
+* Fixed issue [#629](https://github.com/jakubpawlowicz/clean-css/issues/629) - source maps & background shorthands.
+* Fixed issue [#630](https://github.com/jakubpawlowicz/clean-css/issues/630) - vendor prefixed flex optimizations.
+* Fixed issue [#633](https://github.com/jakubpawlowicz/clean-css/issues/633) - handling data URI with brackets.
+* Fixed issue [#634](https://github.com/jakubpawlowicz/clean-css/issues/634) - merging :placeholder selectors.
+
+[3.3.7 / 2015-07-29](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.6...v3.3.7)
+==================
+
+* Fixed issue [#616](https://github.com/jakubpawlowicz/clean-css/issues/616) - ordering in restructuring.
+
+[3.3.6 / 2015-07-14](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.5...v3.3.6)
+==================
+
+* Fixed issue [#620](https://github.com/jakubpawlowicz/clean-css/issues/620) - `bold` style in font shorthands.
+
+[3.3.5 / 2015-07-01](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.4...v3.3.5)
+==================
+
+* Fixed issue [#608](https://github.com/jakubpawlowicz/clean-css/issues/608) - custom URI protocols handling.
+
+[3.3.4 / 2015-06-24](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.3...v3.3.4)
+==================
+
+* Fixed issue [#610](https://github.com/jakubpawlowicz/clean-css/issues/610) - `border:inherit` restoring.
+* Fixed issue [#611](https://github.com/jakubpawlowicz/clean-css/issues/611) - edge case in quote stripping.
+
+[3.3.3 / 2015-06-16](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.2...v3.3.3)
+==================
+
+* Fixed issue [#603](https://github.com/jakubpawlowicz/clean-css/issues/603) - IE suffix hack defaults to on.
+
+[3.3.2 / 2015-06-14](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.1...v3.3.2)
+==================
+
+* Fixed issue [#595](https://github.com/jakubpawlowicz/clean-css/issues/595) - more relaxed block matching.
+* Fixed issue [#601](https://github.com/jakubpawlowicz/clean-css/issues/601) - percentage minifying inside `flex`.
+* Fixed issue [#602](https://github.com/jakubpawlowicz/clean-css/issues/602) - backslash IE hacks after a space.
+
+[3.3.1 / 2015-06-02](https://github.com/jakubpawlowicz/clean-css/compare/v3.3.0...v3.3.1)
+==================
+
+* Fixed issue [#590](https://github.com/jakubpawlowicz/clean-css/issues/590) - edge case in `@import` processing.
+
+[3.3.0 / 2015-05-31](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.11...v3.3.0)
+==================
+
+* Cleans up url rebase code getting rid of unnecessary state.
+* Cleans up tokenizer code getting rid of unnecessary state.
+* Moves source maps tracker into lib/source-maps/track.
+* Moves tokenizer code into lib/tokenizer.
+* Moves URL scanner into lib/urls/reduce (was named incorrectly before).
+* Moves URL rebasing & rewriting into lib/urls.
+* Fixed issue [#375](https://github.com/jakubpawlowicz/clean-css/issues/375) - unit compatibility switches.
+* Fixed issue [#436](https://github.com/jakubpawlowicz/clean-css/issues/436) - refactors URI rewriting.
+* Fixed issue [#448](https://github.com/jakubpawlowicz/clean-css/issues/448) - rebasing no protocol URIs.
+* Fixed issue [#517](https://github.com/jakubpawlowicz/clean-css/issues/517) - turning off color optimizations.
+* Fixed issue [#542](https://github.com/jakubpawlowicz/clean-css/issues/542) - space after closing brace in IE.
+* Fixed issue [#562](https://github.com/jakubpawlowicz/clean-css/issues/562) - optimizing invalid color values.
+* Fixed issue [#563](https://github.com/jakubpawlowicz/clean-css/issues/563) - `background:inherit` restoring.
+* Fixed issue [#570](https://github.com/jakubpawlowicz/clean-css/issues/570) - rebasing "no-url()" imports.
+* Fixed issue [#574](https://github.com/jakubpawlowicz/clean-css/issues/574) - rewriting internal URLs.
+* Fixed issue [#575](https://github.com/jakubpawlowicz/clean-css/issues/575) - missing directory as a `target`.
+* Fixed issue [#577](https://github.com/jakubpawlowicz/clean-css/issues/577) - `background-clip` into shorthand.
+* Fixed issue [#579](https://github.com/jakubpawlowicz/clean-css/issues/579) - `background-origin` into shorthand.
+* Fixed issue [#580](https://github.com/jakubpawlowicz/clean-css/issues/580) - mixed `@import` processing.
+* Fixed issue [#582](https://github.com/jakubpawlowicz/clean-css/issues/582) - overriding with prefixed values.
+* Fixed issue [#583](https://github.com/jakubpawlowicz/clean-css/issues/583) - URL quoting for SVG data.
+* Fixed issue [#587](https://github.com/jakubpawlowicz/clean-css/issues/587) - too aggressive `border` reordering.
+
+[3.2.11 / 2015-05-31](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.10...v3.2.11)
+==================
+
+* Fixed issue [#563](https://github.com/jakubpawlowicz/clean-css/issues/563) - `background:inherit` restoring.
+* Fixed issue [#582](https://github.com/jakubpawlowicz/clean-css/issues/582) - overriding with prefixed values.
+* Fixed issue [#583](https://github.com/jakubpawlowicz/clean-css/issues/583) - URL quoting for SVG data.
+* Fixed issue [#587](https://github.com/jakubpawlowicz/clean-css/issues/587) - too aggressive `border` reordering.
+
+[3.2.10 / 2015-05-14](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.9...v3.2.10)
+==================
+
+* Fixed issue [#572](https://github.com/jakubpawlowicz/clean-css/issues/572) - empty elements removal.
+
+[3.2.9 / 2015-05-08](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.8...v3.2.9)
+==================
+
+* Fixed issue [#567](https://github.com/jakubpawlowicz/clean-css/issues/567) - merging colors as functions.
+
+[3.2.8 / 2015-05-04](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.7...v3.2.8)
+==================
+
+* Fixed issue [#561](https://github.com/jakubpawlowicz/clean-css/issues/561) - restructuring special selectors.
+
+[3.2.7 / 2015-05-03](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.6...v3.2.7)
+==================
+
+* Fixed issue [#551](https://github.com/jakubpawlowicz/clean-css/issues/551) - edge case in restructuring.
+* Fixed issue [#553](https://github.com/jakubpawlowicz/clean-css/issues/553) - another style of SVG fallback.
+* Fixed issue [#558](https://github.com/jakubpawlowicz/clean-css/issues/558) - units in same selector merging.
+
+[3.2.6 / 2015-04-28](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.5...v3.2.6)
+==================
+
+* Fixed issue [#550](https://github.com/jakubpawlowicz/clean-css/issues/550) - proper `contentSources` tracking.
+* Fixed issue [#556](https://github.com/jakubpawlowicz/clean-css/issues/556) - regression in IE backslash hacks.
+
+[3.2.5 / 2015-04-25](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.4...v3.2.5)
+==================
+
+* Fixed issue [#543](https://github.com/jakubpawlowicz/clean-css/issues/543) - better "comment in body" handling.
+* Fixed issue [#548](https://github.com/jakubpawlowicz/clean-css/issues/548) - regression in font minifying.
+* Fixed issue [#549](https://github.com/jakubpawlowicz/clean-css/issues/549) - special comments in source maps.
+
+[3.2.4 / 2015-04-24](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.3...v3.2.4)
+==================
+
+* Fixed issue [#544](https://github.com/jakubpawlowicz/clean-css/issues/544) - regression in same value merging.
+* Fixed issue [#546](https://github.com/jakubpawlowicz/clean-css/issues/546) - IE<11 `calc()` issue.
+
+[3.2.3 / 2015-04-22](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.2...v3.2.3)
+==================
+
+* Fixed issue [#541](https://github.com/jakubpawlowicz/clean-css/issues/541) - `outline-style:auto` in shorthand.
+
+[3.2.2 / 2015-04-21](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.1...v3.2.2)
+==================
+
+* Fixed issue [#537](https://github.com/jakubpawlowicz/clean-css/issues/537) - regression in simple optimizer.
+
+[3.2.1 / 2015-04-20](https://github.com/jakubpawlowicz/clean-css/compare/v3.2.0...v3.2.1)
+==================
+
+* Fixed issue [#534](https://github.com/jakubpawlowicz/clean-css/issues/534) - wrong `@font-face` stringifying.
+
+[3.2.0 / 2015-04-19](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.9...v3.2.0)
+==================
+
+* Bumps commander to 2.8.x.
+* Fixes remote asset rebasing when passing data as a hash.
+* Improves path resolution inside source maps.
+* Makes `root` option implicitely default to `process.cwd()`.
+* Fixed issue [#371](https://github.com/jakubpawlowicz/clean-css/issues/371) - `background` fallback with `none`.
+* Fixed issue [#376](https://github.com/jakubpawlowicz/clean-css/issues/376) - option to disable `0[unit]` -> `0`.
+* Fixed issue [#396](https://github.com/jakubpawlowicz/clean-css/issues/396) - better input source maps tracking.
+* Fixed issue [#397](https://github.com/jakubpawlowicz/clean-css/issues/397) - support for source map sources.
+* Fixed issue [#399](https://github.com/jakubpawlowicz/clean-css/issues/399) - support compacting with source maps.
+* Fixed issue [#429](https://github.com/jakubpawlowicz/clean-css/issues/429) - unifies data tokenization.
+* Fixed issue [#446](https://github.com/jakubpawlowicz/clean-css/issues/446) - `list-style` fuzzy matching.
+* Fixed issue [#468](https://github.com/jakubpawlowicz/clean-css/issues/468) - bumps `source-map` to 0.4.x.
+* Fixed issue [#480](https://github.com/jakubpawlowicz/clean-css/issues/480) - extracting uppercase property names.
+* Fixed issue [#487](https://github.com/jakubpawlowicz/clean-css/issues/487) - source map paths under Windows.
+* Fixed issue [#490](https://github.com/jakubpawlowicz/clean-css/issues/490) - vendor prefixed multivalue `background`.
+* Fixed issue [#500](https://github.com/jakubpawlowicz/clean-css/issues/500) - merging duplicate adjacent properties.
+* Fixed issue [#504](https://github.com/jakubpawlowicz/clean-css/issues/504) - keeping `url()` quotes.
+* Fixed issue [#507](https://github.com/jakubpawlowicz/clean-css/issues/507) - merging longhands into many shorthands.
+* Fixed issue [#508](https://github.com/jakubpawlowicz/clean-css/issues/508) - removing duplicate media queries.
+* Fixed issue [#521](https://github.com/jakubpawlowicz/clean-css/issues/521) - unit optimizations inside `calc()`.
+* Fixed issue [#524](https://github.com/jakubpawlowicz/clean-css/issues/524) - timeouts in `@import` inlining.
+* Fixed issue [#526](https://github.com/jakubpawlowicz/clean-css/issues/526) - shorthand overriding into a function.
+* Fixed issue [#528](https://github.com/jakubpawlowicz/clean-css/issues/528) - better support for IE<9 hacks.
+* Fixed issue [#529](https://github.com/jakubpawlowicz/clean-css/issues/529) - wrong font weight minification.
+
+[3.1.9 / 2015-04-04](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.8...v3.1.9)
+==================
+
+* Fixes issue [#511](https://github.com/jakubpawlowicz/clean-css/issues/511) - `)` advanced processing.
+
+[3.1.8 / 2015-03-17](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.7...v3.1.8)
+==================
+
+* Fixes issue [#498](https://github.com/jakubpawlowicz/clean-css/issues/498) - reordering and flexbox.
+* Fixes issue [#499](https://github.com/jakubpawlowicz/clean-css/issues/499) - too aggressive `-` removal.
+
+[3.1.7 / 2015-03-16](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.6...v3.1.7)
+==================
+
+* Backports fix to [#480](https://github.com/jakubpawlowicz/clean-css/issues/480) - reordering and uppercase properties.
+* Fixes issue [#496](https://github.com/jakubpawlowicz/clean-css/issues/496) - space after bracket removal.
+
+[3.1.6 / 2015-03-12](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.5...v3.1.6)
+==================
+
+* Fixes issue [#489](https://github.com/jakubpawlowicz/clean-css/issues/489) - `AlphaImageLoader` IE filter.
+
+[3.1.5 / 2015-03-06](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.4...v3.1.5)
+==================
+
+* Fixes issue [#483](https://github.com/jakubpawlowicz/clean-css/issues/483) - property order in restructuring.
+
+[3.1.4 / 2015-03-04](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.3...v3.1.4)
+==================
+
+* Fixes issue [#472](https://github.com/jakubpawlowicz/clean-css/issues/472) - broken function minification.
+* Fixes issue [#477](https://github.com/jakubpawlowicz/clean-css/issues/477) - `@import`s order in restructuring.
+* Fixes issue [#478](https://github.com/jakubpawlowicz/clean-css/issues/478) - ultimate fix to brace whitespace.
+
+[3.1.3 / 2015-03-03](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.2...v3.1.3)
+==================
+
+* Fixes issue [#464](https://github.com/jakubpawlowicz/clean-css/issues/464) - data URI with quoted braces.
+* Fixes issue [#475](https://github.com/jakubpawlowicz/clean-css/issues/475) - whitespace after closing brace.
+
+[3.1.2 / 2015-03-01](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.1...v3.1.2)
+==================
+
+* Refixed issue [#471](https://github.com/jakubpawlowicz/clean-css/issues/471) - correct order after restructuring.
+* Fixes issue [#466](https://github.com/jakubpawlowicz/clean-css/issues/466) - rebuilding background shorthand.
+* Fixes issue [#462](https://github.com/jakubpawlowicz/clean-css/issues/462) - escaped apostrophes in selectors.
+
+[3.1.1 / 2015-02-27](https://github.com/jakubpawlowicz/clean-css/compare/v3.1.0...v3.1.1)
+==================
+
+* Fixed issue [#469](https://github.com/jakubpawlowicz/clean-css/issues/469) - extracting broken property.
+* Fixed issue [#470](https://github.com/jakubpawlowicz/clean-css/issues/470) - negative padding removal.
+* Fixed issue [#471](https://github.com/jakubpawlowicz/clean-css/issues/471) - correct order after restructuring.
+
+[3.1.0 / 2015-02-26](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.10...v3.1.0)
+==================
+
+* Adds `0deg` to `0` minification where possible.
+* Adds better non-adjacent selector merging when body is the same.
+* Adds official support for node.js 0.12.
+* Adds official support for io.js 1.0.
+* Adds restructuring optimizations to reorganize selectors, which vastly improves minification.
+* Fixed issue [#158](https://github.com/jakubpawlowicz/clean-css/issues/158) - adds body-based selectors reduction.
+* Fixed issue [#182](https://github.com/jakubpawlowicz/clean-css/issues/182) - removing space after closing brace.
+* Fixed issue [#204](https://github.com/jakubpawlowicz/clean-css/issues/204) - `@media` merging.
+* Fixed issue [#351](https://github.com/jakubpawlowicz/clean-css/issues/351) - remote `@import`s after content.
+* Fixed issue [#357](https://github.com/jakubpawlowicz/clean-css/issues/357) - non-standard but valid URLs.
+* Fixed issue [#416](https://github.com/jakubpawlowicz/clean-css/issues/416) - accepts hash as `minify` argument.
+* Fixed issue [#419](https://github.com/jakubpawlowicz/clean-css/issues/419) - multiple input source maps.
+* Fixed issue [#435](https://github.com/jakubpawlowicz/clean-css/issues/435) - `background-clip` in shorthand.
+* Fixed issue [#439](https://github.com/jakubpawlowicz/clean-css/issues/439) - `background-origin` in shorthand.
+* Fixed issue [#442](https://github.com/jakubpawlowicz/clean-css/issues/442) - space before adjacent `nav`.
+* Fixed issue [#445](https://github.com/jakubpawlowicz/clean-css/issues/445) - regression issue in url processor.
+* Fixed issue [#449](https://github.com/jakubpawlowicz/clean-css/issues/449) - warns of missing close braces.
+* Fixed issue [#463](https://github.com/jakubpawlowicz/clean-css/issues/463) - relative remote `@import` URLs.
+
+[3.0.10 / 2015-02-07](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.9...v3.0.10)
+==================
+
+* Fixed issue [#453](https://github.com/jakubpawlowicz/clean-css/issues/453) - double `background-repeat`.
+* Fixed issue [#455](https://github.com/jakubpawlowicz/clean-css/issues/455) - property extracting regression.
+
+[3.0.9 / 2015-02-04](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.8...v3.0.9)
+==================
+
+* Fixed issue [#452](https://github.com/jakubpawlowicz/clean-css/issues/452) - regression in advanced merging.
+
+[3.0.8 / 2015-01-31](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.7...v3.0.8)
+==================
+
+* Fixed issue [#447](https://github.com/jakubpawlowicz/clean-css/issues/447) - `background-color` in shorthands.
+* Fixed issue [#450](https://github.com/jakubpawlowicz/clean-css/issues/450) - name to hex color converting.
+
+[3.0.7 / 2015-01-22](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.6...v3.0.7)
+==================
+
+* Fixed issue [#441](https://github.com/jakubpawlowicz/clean-css/issues/441) - hex to name color converting.
+
+[3.0.6 / 2015-01-20](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.5...v3.0.6)
+==================
+
+* Refixed issue [#414](https://github.com/jakubpawlowicz/clean-css/issues/414) - source maps position fallback.
+
+[3.0.5 / 2015-01-18](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.4...v3.0.5)
+==================
+
+* Fixed issue [#414](https://github.com/jakubpawlowicz/clean-css/issues/414) - source maps position fallback.
+* Fixed issue [#433](https://github.com/jakubpawlowicz/clean-css/issues/433) - meging `!important` in shorthands.
+
+[3.0.4 / 2015-01-11](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.3...v3.0.4)
+==================
+
+* Fixed issue [#314](https://github.com/jakubpawlowicz/clean-css/issues/314) - spaces inside `calc`.
+
+[3.0.3 / 2015-01-07](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.2...v3.0.3)
+==================
+
+* Just a version bump as npm incorrectly things 2.2.23 is the latest one.
+
+[3.0.2 / 2015-01-04](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.1...v3.0.2)
+==================
+
+* Fixed issue [#422](https://github.com/jakubpawlowicz/clean-css/issues/422) - handling `calc` as a unit.
+
+[3.0.1 / 2014-12-19](https://github.com/jakubpawlowicz/clean-css/compare/v3.0.0...v3.0.1)
+==================
+
+* Fixed issue [#410](https://github.com/jakubpawlowicz/clean-css/issues/410) - advanced merging and comments.
+* Fixed issue [#411](https://github.com/jakubpawlowicz/clean-css/issues/411) - properties and important comments.
+
+[3.0.0 / 2014-12-18](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.22...v3.0.0)
+==================
+
+* Adds more granular control over compatibility settings.
+* Adds support for @counter-style at-rule.
+* Adds `--source-map`/`sourceMap` switch for building input's source map.
+* Adds `--skip-shorthand-compacting`/`shorthandComacting` option for disabling shorthand compacting.
+* Allows `target` option to be a path to a folder instead of a file.
+* Allows disabling rounding precision. By [@superlukas](https://github.com/superlukas).
+* Breaks 2.x compatibility for using CleanCSS as a function.
+* Changes `minify` method output to handle multiple outputs.
+* Reworks minification to tokenize first then minify.
+  See [changes](https://github.com/jakubpawlowicz/clean-css/compare/b06f37d...dd8c14a).
+* Removes support for node.js 0.8.x.
+* Renames `noAdvanced` option into `advanced`.
+* Renames `noAggressiveMerging` option into `aggressiveMerging`.
+* Renames `noRebase` option into `rebase`.
+* Speeds up advanced processing by shortening optimize loop.
+* Fixed issue [#125](https://github.com/jakubpawlowicz/clean-css/issues/125) - source maps!
+* Fixed issue [#344](https://github.com/jakubpawlowicz/clean-css/issues/344) - merging `background-size` into shorthand.
+* Fixed issue [#352](https://github.com/jakubpawlowicz/clean-css/issues/352) - honors rebasing in imported stylesheets.
+* Fixed issue [#360](https://github.com/jakubpawlowicz/clean-css/issues/360) - adds 7 extra CSS colors.
+* Fixed issue [#363](https://github.com/jakubpawlowicz/clean-css/issues/363) - `rem` units overriding `px`.
+* Fixed issue [#373](https://github.com/jakubpawlowicz/clean-css/issues/373) - proper `background` shorthand merging.
+* Fixed issue [#395](https://github.com/jakubpawlowicz/clean-css/issues/395) - unescaped brackets in data URIs.
+* Fixed issue [#398](https://github.com/jakubpawlowicz/clean-css/issues/398) - restoring important comments.
+* Fixed issue [#400](https://github.com/jakubpawlowicz/clean-css/issues/400) - API to accept an array of filenames.
+* Fixed issue [#403](https://github.com/jakubpawlowicz/clean-css/issues/403) - tracking input files in source maps.
+* Fixed issue [#404](https://github.com/jakubpawlowicz/clean-css/issues/404) - no state sharing in API.
+* Fixed issue [#405](https://github.com/jakubpawlowicz/clean-css/issues/405) - disables default `background-size` merging.
+* Refixed issue [#304](https://github.com/jakubpawlowicz/clean-css/issues/304) - `background-position` merging.
+
+[2.2.22 / 2014-12-13](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.21...v2.2.22)
+==================
+
+* Backports fix to issue [#304](https://github.com/jakubpawlowicz/clean-css/issues/304) - `background-position` merging.
+
+[2.2.21 / 2014-12-10](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.20...v2.2.21)
+==================
+
+* Backports fix to issue [#373](https://github.com/jakubpawlowicz/clean-css/issues/373) - `background` shorthand merging.
+
+[2.2.20 / 2014-12-02](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.19...v2.2.20)
+==================
+
+* Backports fix to issue [#390](https://github.com/jakubpawlowicz/clean-css/issues/390) - pseudo-class merging.
+
+[2.2.19 / 2014-11-20](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.18...v2.2.19)
+==================
+
+* Fixed issue [#385](https://github.com/jakubpawlowicz/clean-css/issues/385) - edge cases in processing cut off data.
+
+[2.2.18 / 2014-11-17](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.17...v2.2.18)
+==================
+
+* Fixed issue [#383](https://github.com/jakubpawlowicz/clean-css/issues/383) - rounding fractions once again.
+
+[2.2.17 / 2014-11-09](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.16...v2.2.17)
+==================
+
+* Fixed issue [#380](https://github.com/jakubpawlowicz/clean-css/issues/380) - rounding fractions to a whole number.
+
+[2.2.16 / 2014-09-16](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.15...v2.2.16)
+==================
+
+* Fixed issue [#359](https://github.com/jakubpawlowicz/clean-css/issues/359) - handling escaped double backslash.
+* Fixed issue [#358](https://github.com/jakubpawlowicz/clean-css/issues/358) - property merging in compatibility mode.
+* Fixed issue [#356](https://github.com/jakubpawlowicz/clean-css/issues/356) - preserving `*+html` hack.
+* Fixed issue [#354](https://github.com/jakubpawlowicz/clean-css/issues/354) - `!important` overriding in shorthands.
+
+[2.2.15 / 2014-09-01](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.14...v2.2.15)
+==================
+
+* Fixed issue [#343](https://github.com/jakubpawlowicz/clean-css/issues/343) - too aggressive `rgba`/`hsla` minification.
+* Fixed issue [#345](https://github.com/jakubpawlowicz/clean-css/issues/345) - URL rebasing for document relative ones.
+* Fixed issue [#346](https://github.com/jakubpawlowicz/clean-css/issues/346) - overriding `!important` by `!important`.
+* Fixed issue [#350](https://github.com/jakubpawlowicz/clean-css/issues/350) - edge cases in `@import` processing.
+
+[2.2.14 / 2014-08-25](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.13...v2.2.14)
+==================
+
+* Makes multival operations idempotent.
+* Fixed issue [#339](https://github.com/jakubpawlowicz/clean-css/issues/339) - skips invalid properties.
+* Fixed issue [#341](https://github.com/jakubpawlowicz/clean-css/issues/341) - ensure output is shorter than input.
+
+[2.2.13 / 2014-08-12](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.12...v2.2.13)
+==================
+
+* Fixed issue [#337](https://github.com/jakubpawlowicz/clean-css/issues/337) - handling component importance.
+
+[2.2.12 / 2014-08-02](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.11...v2.2.12)
+==================
+
+* Fixed issue with tokenizer removing first selector after an unknown @ rule.
+* Fixed issue [#329](https://github.com/jakubpawlowicz/clean-css/issues/329) - `font` shorthands incorrectly processed.
+* Fixed issue [#332](https://github.com/jakubpawlowicz/clean-css/issues/332) - `background` shorthand with colors.
+* Refixed issue [#325](https://github.com/jakubpawlowicz/clean-css/issues/325) - invalid charset declarations.
+
+[2.2.11 / 2014-07-28](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.10...v2.2.11)
+==================
+
+* Fixed issue [#326](https://github.com/jakubpawlowicz/clean-css/issues/326) - `background-size` regression.
+
+[2.2.10 / 2014-07-27](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.9...v2.2.10)
+==================
+
+* Improved performance of advanced mode validators.
+* Fixed issue [#307](https://github.com/jakubpawlowicz/clean-css/issues/307) - `background-color` in multiple backgrounds.
+* Fixed issue [#322](https://github.com/jakubpawlowicz/clean-css/issues/322) - adds `background-size` support.
+* Fixed issue [#323](https://github.com/jakubpawlowicz/clean-css/issues/323) - stripping variable references.
+* Fixed issue [#325](https://github.com/jakubpawlowicz/clean-css/issues/325) - removing invalid `@charset` declarations.
+
+[2.2.9 / 2014-07-23](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.8...v2.2.9)
+==================
+
+* Adds `background` normalization according to W3C spec.
+* Fixed issue [#316](https://github.com/jakubpawlowicz/clean-css/issues/316) - incorrect `background` processing.
+
+[2.2.8 / 2014-07-14](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.7...v2.2.8)
+==================
+
+* Fixed issue [#313](https://github.com/jakubpawlowicz/clean-css/issues/313) - processing comment marks in URLs.
+* Fixed issue [#315](https://github.com/jakubpawlowicz/clean-css/issues/315) - `rgba`/`hsla` -> `transparent` in gradients.
+
+[2.2.7 / 2014-07-10](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.6...v2.2.7)
+==================
+
+* Fixed issue [#304](https://github.com/jakubpawlowicz/clean-css/issues/304) - merging multiple backgrounds.
+* Fixed issue [#312](https://github.com/jakubpawlowicz/clean-css/issues/312) - merging with mixed repeat.
+
+[2.2.6 / 2014-07-05](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.5...v2.2.6)
+==================
+
+* Adds faster quote matching in QuoteScanner.
+* Improves QuoteScanner to handle comments correctly.
+* Fixed issue [#308](https://github.com/jakubpawlowicz/clean-css/issues/308) - parsing comments in quoted URLs.
+* Fixed issue [#311](https://github.com/jakubpawlowicz/clean-css/issues/311) - leading/trailing decimal points.
+
+[2.2.5 / 2014-06-29](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.4...v2.2.5)
+==================
+
+* Adds removing extra spaces around / in border-radius.
+* Adds replacing same horizontal & vertical value in border-radius.
+* Fixed issue [#305](https://github.com/jakubpawlowicz/clean-css/issues/305) - allows width keywords in `border-width`.
+
+[2.2.4 / 2014-06-27](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.3...v2.2.4)
+==================
+
+* Fixed issue [#301](https://github.com/jakubpawlowicz/clean-css/issues/301) - proper `border-radius` processing.
+* Fixed issue [#303](https://github.com/jakubpawlowicz/clean-css/issues/303) - correctly preserves viewport units.
+
+[2.2.3 / 2014-06-24](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.2...v2.2.3)
+==================
+
+* Fixed issue [#302](https://github.com/jakubpawlowicz/clean-css/issues/302) - handling of `outline-style: auto`.
+
+[2.2.2 / 2014-06-18](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.1...v2.2.2)
+==================
+
+* Fixed issue [#297](https://github.com/jakubpawlowicz/clean-css/issues/297) - `box-shadow` zeros minification.
+
+[2.2.1 / 2014-06-14](https://github.com/jakubpawlowicz/clean-css/compare/v2.2.0...v2.2.1)
+==================
+
+* Fixes new property optimizer for 'none' values.
+* Fixed issue [#294](https://github.com/jakubpawlowicz/clean-css/issues/294) - space after `rgba`/`hsla` in IE<=11.
+
+[2.2.0 / 2014-06-11](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.8...v2.2.0)
+==================
+
+* Adds a better algorithm for quotation marks' removal.
+* Adds a better non-adjacent optimizer compatible with the upcoming new property optimizer.
+* Adds minifying remote files directly from CLI.
+* Adds `--rounding-precision` to control rounding precision.
+* Moves quotation matching into a `QuoteScanner` class.
+* Adds `npm run browserify` for creating embeddable version of clean-css.
+* Fixed list-style-* advanced processing.
+* Fixed issue [#134](https://github.com/jakubpawlowicz/clean-css/issues/134) - merges properties into shorthand form.
+* Fixed issue [#164](https://github.com/jakubpawlowicz/clean-css/issues/164) - removes default values if not needed.
+* Fixed issue [#168](https://github.com/jakubpawlowicz/clean-css/issues/168) - adds better property merging algorithm.
+* Fixed issue [#173](https://github.com/jakubpawlowicz/clean-css/issues/173) - merges same properties if grouped.
+* Fixed issue [#184](https://github.com/jakubpawlowicz/clean-css/issues/184) - uses `!important` for optimization opportunities.
+* Fixed issue [#190](https://github.com/jakubpawlowicz/clean-css/issues/190) - uses shorthand to override another shorthand.
+* Fixed issue [#197](https://github.com/jakubpawlowicz/clean-css/issues/197) - adds borders merging by understandability.
+* Fixed issue [#210](https://github.com/jakubpawlowicz/clean-css/issues/210) - adds temporary workaround for aggressive merging.
+* Fixed issue [#246](https://github.com/jakubpawlowicz/clean-css/issues/246) - removes IE hacks when not in compatibility mode.
+* Fixed issue [#247](https://github.com/jakubpawlowicz/clean-css/issues/247) - removes deprecated `selectorsMergeMode` switch.
+* Refixed issue [#250](https://github.com/jakubpawlowicz/clean-css/issues/250) - based on new quotation marks removal.
+* Fixed issue [#257](https://github.com/jakubpawlowicz/clean-css/issues/257) - turns `rgba`/`hsla` to `transparent` if possible.
+* Fixed issue [#265](https://github.com/jakubpawlowicz/clean-css/issues/265) - adds support for multiple input files.
+* Fixed issue [#275](https://github.com/jakubpawlowicz/clean-css/issues/275) - handling transform properties.
+* Fixed issue [#276](https://github.com/jakubpawlowicz/clean-css/issues/276) - corrects unicode handling.
+* Fixed issue [#288](https://github.com/jakubpawlowicz/clean-css/issues/288) - adds smarter expression parsing.
+* Fixed issue [#293](https://github.com/jakubpawlowicz/clean-css/issues/293) - handles escaped `@` symbols in class names and IDs.
+
+[2.1.8 / 2014-03-28](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.7...v2.1.8)
+==================
+
+* Fixed issue [#267](https://github.com/jakubpawlowicz/clean-css/issues/267) - incorrect non-adjacent selector merging.
+
+[2.1.7 / 2014-03-24](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.6...v2.1.7)
+==================
+
+* Fixed issue [#264](https://github.com/jakubpawlowicz/clean-css/issues/264) - `@import` statements inside comments.
+
+[2.1.6 / 2014-03-10](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.5...v2.1.6)
+==================
+
+* Fixed issue [#258](https://github.com/jakubpawlowicz/clean-css/issues/258) - wrong `@import` handling in `EmptyRemoval`.
+
+[2.1.5 / 2014-03-07](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.4...v2.1.5)
+==================
+
+* Fixed issue [#255](https://github.com/jakubpawlowicz/clean-css/issues/255) - incorrect processing of a trailing `-0`.
+
+[2.1.4 / 2014-03-01](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.3...v2.1.4)
+==================
+
+* Fixed issue [#250](https://github.com/jakubpawlowicz/clean-css/issues/250) - correctly handle JSON data in quotations.
+
+[2.1.3 / 2014-02-26](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.2...v2.1.3)
+==================
+
+* Fixed issue [#248](https://github.com/jakubpawlowicz/clean-css/issues/248) - incorrect merging for vendor selectors.
+
+[2.1.2 / 2014-02-25](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.1...v2.1.2)
+==================
+
+* Fixed issue [#245](https://github.com/jakubpawlowicz/clean-css/issues/245) - incorrect handling of backslash IE hack.
+
+[2.1.1 / 2014-02-18](https://github.com/jakubpawlowicz/clean-css/compare/v2.1.0...v2.1.1)
+==================
+
+* Adds faster selectors processing in advanced optimizer.
+* Fixed issue [#241](https://github.com/jakubpawlowicz/clean-css/issues/241) - incorrect handling of `:not()` selectors.
+
+[2.1.0 / 2014-02-13](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.8...v2.1.0)
+==================
+
+* Adds an optional callback to minify method.
+* Deprecates `--selectors-merge-mode` / `selectorsMergeMode` in favor to `--compatibility` / `compatibility`.
+* Fixes debug mode stats for stylesheets using `@import` statements.
+* Skips empty removal if advanced processing is enabled.
+* Fixed issue [#85](https://github.com/jakubpawlowicz/clean-css/issues/85) - resolving protocol `@import`s.
+* Fixed issue [#160](https://github.com/jakubpawlowicz/clean-css/issues/160) - re-runs optimizer until a clean pass.
+* Fixed issue [#161](https://github.com/jakubpawlowicz/clean-css/issues/161) - improves tokenizer performance.
+* Fixed issue [#163](https://github.com/jakubpawlowicz/clean-css/issues/163) - round pixels to 2nd decimal place.
+* Fixed issue [#165](https://github.com/jakubpawlowicz/clean-css/issues/165) - extra space after trailing parenthesis.
+* Fixed issue [#186](https://github.com/jakubpawlowicz/clean-css/issues/186) - strip unit from `0rem`.
+* Fixed issue [#207](https://github.com/jakubpawlowicz/clean-css/issues/207) - bug in parsing protocol `@import`s.
+* Fixed issue [#213](https://github.com/jakubpawlowicz/clean-css/issues/213) - faster `rgb` to `hex` transforms.
+* Fixed issue [#215](https://github.com/jakubpawlowicz/clean-css/issues/215) - leading zeros in numerical values.
+* Fixed issue [#217](https://github.com/jakubpawlowicz/clean-css/issues/217) - whitespace inside attribute selectors and URLs.
+* Fixed issue [#218](https://github.com/jakubpawlowicz/clean-css/issues/218) - `@import` statements cleanup.
+* Fixed issue [#220](https://github.com/jakubpawlowicz/clean-css/issues/220) - selector between comments.
+* Fixed issue [#223](https://github.com/jakubpawlowicz/clean-css/issues/223) - two-pass adjacent selectors merging.
+* Fixed issue [#226](https://github.com/jakubpawlowicz/clean-css/issues/226) - don't minify `border:none` to `border:0`.
+* Fixed issue [#229](https://github.com/jakubpawlowicz/clean-css/issues/229) - improved processing of fraction numbers.
+* Fixed issue [#230](https://github.com/jakubpawlowicz/clean-css/issues/230) - better handling of zero values.
+* Fixed issue [#235](https://github.com/jakubpawlowicz/clean-css/issues/235) - IE7 compatibility mode.
+* Fixed issue [#236](https://github.com/jakubpawlowicz/clean-css/issues/236) - incorrect rebasing with nested `import`s.
+
+[2.0.8 / 2014-02-07](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.7...v2.0.8)
+==================
+
+* Fixed issue [#232](https://github.com/jakubpawlowicz/clean-css/issues/232) - edge case in non-adjacent selectors merging.
+
+[2.0.7 / 2014-01-16](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.6...v2.0.7)
+==================
+
+* Fixed issue [#208](https://github.com/jakubpawlowicz/clean-css/issues/208) - don't swallow `@page` and `@viewport`.
+
+[2.0.6 / 2014-01-04](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.5...v2.0.6)
+==================
+
+* Fixed issue [#198](https://github.com/jakubpawlowicz/clean-css/issues/198) - process comments and `@import`s correctly.
+* Fixed issue [#205](https://github.com/jakubpawlowicz/clean-css/issues/205) - freeze on broken `@import` declaration.
+
+[2.0.5 / 2014-01-03](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.4...v2.0.5)
+==================
+
+* Fixed issue [#199](https://github.com/jakubpawlowicz/clean-css/issues/199) - keep line breaks with no advanced optimizations.
+* Fixed issue [#203](https://github.com/jakubpawlowicz/clean-css/issues/203) - Buffer as a first argument to minify method.
+
+[2.0.4 / 2013-12-19](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.3...v2.0.4)
+==================
+
+* Fixed issue [#193](https://github.com/jakubpawlowicz/clean-css/issues/193) - HSL color space normalization.
+
+[2.0.3 / 2013-12-18](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.2...v2.0.3)
+==================
+
+* Fixed issue [#191](https://github.com/jakubpawlowicz/clean-css/issues/191) - leading numbers in `font`/`animation` names.
+* Fixed issue [#192](https://github.com/jakubpawlowicz/clean-css/issues/192) - many `@import`s inside a comment.
+
+[2.0.2 / 2013-11-18](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.1...v2.0.2)
+==================
+
+* Fixed issue [#177](https://github.com/jakubpawlowicz/clean-css/issues/177) - process broken content correctly.
+
+[2.0.1 / 2013-11-14](https://github.com/jakubpawlowicz/clean-css/compare/v2.0.0...v2.0.1)
+==================
+
+* Fixed issue [#176](https://github.com/jakubpawlowicz/clean-css/issues/176) - hangs on `undefined` keyword.
+
+[2.0.0 / 2013-11-04](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.7...v2.0.0)
+==================
+
+* Adds simplified and more advanced text escaping / restoring via `EscapeStore` class.
+* Adds simplified and much faster empty elements removal.
+* Adds missing `@import` processing to our benchmark (run via `npm run bench`).
+* Adds CSS tokenizer which will make it possible to optimize content by reordering and/or merging selectors.
+* Adds basic optimizer removing duplicate selectors from a list.
+* Adds merging duplicate properties within a single selector's body.
+* Adds merging adjacent selectors within a scope (single and multiple ones).
+* Changes behavior of `--keep-line-breaks`/`keepBreaks` option to keep breaks after trailing braces only.
+* Makes all multiple selectors ordered alphabetically (aids merging).
+* Adds property overriding so more coarse properties override more granular ones.
+* Adds reducing non-adjacent selectors.
+* Adds `--skip-advanced`/`noAdvanced` switch to disable advanced optimizations.
+* Adds reducing non-adjacent selectors when overridden by more complex selectors.
+* Fixed issue [#138](https://github.com/jakubpawlowicz/clean-css/issues/138) - makes CleanCSS interface OO.
+* Fixed issue [#139](https://github.com/jakubpawlowicz/clean-css/issues/138) - consistent error & warning handling.
+* Fixed issue [#145](https://github.com/jakubpawlowicz/clean-css/issues/145) - debug mode in library too.
+* Fixed issue [#157](https://github.com/jakubpawlowicz/clean-css/issues/157) - gets rid of `removeEmpty` option.
+* Fixed issue [#159](https://github.com/jakubpawlowicz/clean-css/issues/159) - escaped quotes inside content.
+* Fixed issue [#162](https://github.com/jakubpawlowicz/clean-css/issues/162) - strip quotes from Base64 encoded URLs.
+* Fixed issue [#166](https://github.com/jakubpawlowicz/clean-css/issues/166) - `debug` formatting in CLI
+* Fixed issue [#167](https://github.com/jakubpawlowicz/clean-css/issues/167) - `background:transparent` minification.
+
+[1.1.7 / 2013-10-28](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.6...v1.1.7)
+==================
+
+* Fixed issue [#156](https://github.com/jakubpawlowicz/clean-css/issues/156) - `@import`s inside comments.
+
+[1.1.6 / 2013-10-26](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.5...v1.1.6)
+==================
+
+* Fixed issue [#155](https://github.com/jakubpawlowicz/clean-css/issues/155) - broken irregular CSS content.
+
+[1.1.5 / 2013-10-24](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.4...v1.1.5)
+==================
+
+* Fixed issue [#153](https://github.com/jakubpawlowicz/clean-css/issues/153) - `keepSpecialComments` `0`/`1` as a string.
+
+[1.1.4 / 2013-10-23](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.3...v1.1.4)
+==================
+
+* Fixed issue [#152](https://github.com/jakubpawlowicz/clean-css/issues/152) - adds an option to disable rebasing.
+
+[1.1.3 / 2013-10-04](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.2...v1.1.3)
+==================
+
+* Fixed issue [#150](https://github.com/jakubpawlowicz/clean-css/issues/150) - minifying `background:none`.
+
+[1.1.2 / 2013-09-29](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.1...v1.1.2)
+==================
+
+* Fixed issue [#149](https://github.com/jakubpawlowicz/clean-css/issues/149) - shorthand `font` property.
+
+[1.1.1 / 2013-09-07](https://github.com/jakubpawlowicz/clean-css/compare/v1.1.0...v1.1.1)
+==================
+
+* Fixed issue [#144](https://github.com/jakubpawlowicz/clean-css/issues/144) - skip URLs rebasing by default.
+
+[1.1.0 / 2013-09-06](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.12...v1.1.0)
+==================
+
+* Renamed lib's `debug` option to `benchmark` when doing per-minification benchmarking.
+* Added simplified comments processing & imports.
+* Fixed issue [#43](https://github.com/jakubpawlowicz/clean-css/issues/43) - `--debug` switch for minification stats.
+* Fixed issue [#65](https://github.com/jakubpawlowicz/clean-css/issues/65) - full color name / hex shortening.
+* Fixed issue [#84](https://github.com/jakubpawlowicz/clean-css/issues/84) - support for `@import` with media queries.
+* Fixed issue [#124](https://github.com/jakubpawlowicz/clean-css/issues/124) - raise error on broken imports.
+* Fixed issue [#126](https://github.com/jakubpawlowicz/clean-css/issues/126) - proper CSS expressions handling.
+* Fixed issue [#129](https://github.com/jakubpawlowicz/clean-css/issues/129) - rebasing imported URLs.
+* Fixed issue [#130](https://github.com/jakubpawlowicz/clean-css/issues/130) - better code modularity.
+* Fixed issue [#135](https://github.com/jakubpawlowicz/clean-css/issues/135) - require node.js 0.8+.
+
+[1.0.12 / 2013-07-19](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.11...v1.0.12)
+===================
+
+* Fixed issue [#121](https://github.com/jakubpawlowicz/clean-css/issues/121) - ability to skip `@import` processing.
+
+[1.0.11 / 2013-07-08](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.10...v1.0.11)
+===================
+
+* Fixed issue [#117](https://github.com/jakubpawlowicz/clean-css/issues/117) - line break escaping in comments.
+
+[1.0.10 / 2013-06-13](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.9...v1.0.10)
+===================
+
+* Fixed issue [#114](https://github.com/jakubpawlowicz/clean-css/issues/114) - comments in imported stylesheets.
+
+[1.0.9 / 2013-06-11](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.8...v1.0.9)
+==================
+
+* Fixed issue [#113](https://github.com/jakubpawlowicz/clean-css/issues/113) - `@import` in comments.
+
+[1.0.8 / 2013-06-10](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.7...v1.0.8)
+==================
+
+* Fixed issue [#112](https://github.com/jakubpawlowicz/clean-css/issues/112) - reducing `box-shadow` zeros.
+
+[1.0.7 / 2013-06-05](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.6...v1.0.7)
+==================
+
+* Support for `@import` URLs starting with `//`. By [@petetak](https://github.com/petetak).
+
+[1.0.6 / 2013-06-04](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.5...v1.0.6)
+==================
+
+* Fixed issue [#110](https://github.com/jakubpawlowicz/clean-css/issues/110) - data URIs in URLs.
+
+[1.0.5 / 2013-05-26](https://github.com/jakubpawlowicz/clean-css/compare/v1.0.4...v1.0.5)
+==================
+
+* Fixed issue [#107](https://github.com/jakubpawlowicz/clean-css/issues/107) - data URIs in imported stylesheets.
+
+1.0.4 / 2013-05-23
+==================
+
+* Rewrite relative URLs in imported stylesheets. By [@bluej100](https://github.com/bluej100).
+
+1.0.3 / 2013-05-20
+==================
+
+* Support alternative `@import` syntax with file name not wrapped inside `url()` statement.
+  By [@bluej100](https://github.com/bluej100).
+
+1.0.2 / 2013-04-29
+==================
+
+* Fixed issue [#97](https://github.com/jakubpawlowicz/clean-css/issues/97) - `--remove-empty` & FontAwesome.
+
+1.0.1 / 2013-04-08
+==================
+
+* Do not pick up `bench` and `test` while building `npm` package.
+  By [@sindresorhus](https://https://github.com/sindresorhus).
+
+1.0.0 / 2013-03-30
+==================
+
+* Fixed issue [#2](https://github.com/jakubpawlowicz/clean-css/issues/2) - resolving `@import` rules.
+* Fixed issue [#44](https://github.com/jakubpawlowicz/clean-css/issues/44) - examples in `--help`.
+* Fixed issue [#46](https://github.com/jakubpawlowicz/clean-css/issues/46) - preserving special characters in URLs and attributes.
+* Fixed issue [#80](https://github.com/jakubpawlowicz/clean-css/issues/80) - quotation in multi line strings.
+* Fixed issue [#83](https://github.com/jakubpawlowicz/clean-css/issues/83) - HSL to hex color conversions.
+* Fixed issue [#86](https://github.com/jakubpawlowicz/clean-css/issues/86) - broken `@charset` replacing.
+* Fixed issue [#88](https://github.com/jakubpawlowicz/clean-css/issues/88) - removes space in `! important`.
+* Fixed issue [#92](https://github.com/jakubpawlowicz/clean-css/issues/92) - uppercase hex to short versions.
+
+0.10.2 / 2013-03-19
+===================
+
+* Fixed issue [#79](https://github.com/jakubpawlowicz/clean-css/issues/79) - node.js 0.10.x compatibility.
+
+0.10.1 / 2013-02-14
+===================
+
+* Fixed issue [#66](https://github.com/jakubpawlowicz/clean-css/issues/66) - line breaks without extra spaces should
+  be handled correctly.
+
+0.10.0 / 2013-02-09
+===================
+
+* Switched from [optimist](https://github.com/substack/node-optimist) to
+  [commander](https://github.com/visionmedia/commander.js) for CLI processing.
+* Changed long options from `--removeempty` to `--remove-empty` and from `--keeplinebreaks` to `--keep-line-breaks`.
+* Fixed performance issue with replacing multiple `@charset` declarations and issue
+  with line break after `@charset` when using `keepLineBreaks` option. By [@rrjaime](https://github.com/rrjamie).
+* Removed Makefile in favor to `npm run` commands (e.g. `make check` -> `npm run check`).
+* Fixed issue [#47](https://github.com/jakubpawlowicz/clean-css/issues/47) - commandline issues on Windows.
+* Fixed issue [#49](https://github.com/jakubpawlowicz/clean-css/issues/49) - remove empty selectors from media query.
+* Fixed issue [#52](https://github.com/jakubpawlowicz/clean-css/issues/52) - strip fraction zeros if not needed.
+* Fixed issue [#58](https://github.com/jakubpawlowicz/clean-css/issues/58) - remove colon where possible.
+* Fixed issue [#59](https://github.com/jakubpawlowicz/clean-css/issues/59) - content property handling.
+
+0.9.1 / 2012-12-19
+==================
+
+* Fixed issue [#37](https://github.com/jakubpawlowicz/clean-css/issues/37) - converting
+  `white` and other colors in class names (reported by [@malgorithms](https://github.com/malgorithms)).
+
+0.9.0 / 2012-12-15
+==================
+
+* Added stripping quotation from font names (if possible).
+* Added stripping quotation from `@keyframes` declaration, `animation` and
+  `animation-name` property.
+* Added stripping quotations from attributes' value (e.g. `[data-target='x']`).
+* Added better hex->name and name->hex color shortening.
+* Added `font: normal` and `font: bold` shortening the same way as `font-weight` is.
+* Refactored shorthand selectors and added `border-radius`, `border-style`
+  and `border-color` shortening.
+* Added `margin`, `padding` and `border-width` shortening.
+* Added removing line break after commas.
+* Fixed removing whitespace inside media query definition.
+* Added removing line breaks after a comma, so all declarations are one-liners now.
+* Speed optimizations (~10% despite many new features).
+* Added [JSHint](https://github.com/jshint/jshint/) validation rules via `make check`.
+
+0.8.3 / 2012-11-29
+==================
+
+* Fixed HSL/HSLA colors processing.
+
+0.8.2 / 2012-10-31
+==================
+
+* Fixed shortening hex colors and their relation to hashes in URLs.
+* Cleanup by [@XhmikosR](https://github.com/XhmikosR).
+
+0.8.1 / 2012-10-28
+==================
+
+* Added better zeros processing for `rect(...)` syntax (clip property).
+
+0.8.0 / 2012-10-21
+==================
+
+* Added removing URLs quotation if possible.
+* Rewrote breaks processing.
+* Added `keepBreaks`/`-b` option to keep line breaks in the minimized file.
+* Reformatted [lib/clean.js](/lib/clean.js) so it's easier to follow the rules.
+* Minimized test data is now minimized with line breaks so it's easier to
+  compare the changes line by line.
+
+0.7.0 / 2012-10-14
+==================
+
+* Added stripping special comments to CLI (`--s0` and `--s1` options).
+* Added stripping special comments to programmatic interface
+  (`keepSpecialComments` option).
+
+0.6.0 / 2012-08-05
+==================
+
+* Full Windows support with tests (./test.bat).
+
+0.5.0 / 2012-08-02
+==================
+
+* Made path to vows local.
+* Explicit node.js 0.6 requirement.
+
+0.4.2 / 2012-06-28
+==================
+
+* Updated binary `-v` option (version).
+* Updated binary to output help when no options given (but not in piped mode).
+* Added binary tests.
+
+0.4.1 / 2012-06-10
+==================
+
+* Fixed stateless mode where calling `CleanCSS#process` directly was giving
+  errors (reported by [@facelessuser](https://github.com/facelessuser)).
+
+0.4.0 / 2012-06-04
+==================
+
+* Speed improvements up to 4x thanks to the rewrite of comments and CSS' content
+  processing.
+* Stripping empty CSS tags is now optional (see [bin/cleancss](/bin/cleancss) for details).
+* Improved debugging mode (see [test/bench.js](/test/bench.js))
+* Added `make bench` for a one-pass benchmark.
+
+0.3.3 / 2012-05-27
+==================
+
+* Fixed tests, [package.json](/package.json) for development, and regex
+  for removing empty declarations (thanks to [@vvo](https://github.com/vvo)).
+
+0.3.2 / 2012-01-17
+==================
+
+* Fixed output method under node.js 0.6 which incorrectly tried to close
+  `process.stdout`.
+
+0.3.1 / 2011-12-16
+==================
+
+* Fixed cleaning up `0 0 0 0` expressions.
+
+0.3.0 / 2011-11-29
+==================
+
+* Clean-css requires node.js 0.4.0+ to run.
+* Removed node.js's 0.2.x 'sys' package dependency
+  (thanks to [@jmalonzo](https://github.com/jmalonzo) for a patch).
+
+0.2.6 / 2011-11-27
+==================
+
+* Fixed expanding `+` signs in `calc()` when mixed up with adjacent `+` selector.
+
+0.2.5 / 2011-11-27
+==================
+
+* Fixed issue with cleaning up spaces inside `calc`/`-moz-calc` declarations
+  (thanks to [@cvan](https://github.com/cvan) for reporting it).
+* Fixed converting `#f00` to `red` in borders and gradients.
+
+0.2.4 / 2011-05-25
+==================
+
+* Fixed problem with expanding `none` to `0` in partial/full background
+  declarations.
+* Fixed including clean-css library from binary (global to local).
+
+0.2.3 / 2011-04-18
+==================
+
+* Fixed problem with optimizing IE filters.
+
+0.2.2 / 2011-04-17
+==================
+
+* Fixed problem with space before color in `border` property.
+
+0.2.1 / 2011-03-19
+==================
+
+* Added stripping space before `!important` keyword.
+* Updated repository location and author information in [package.json](/package.json).
+
+0.2.0 / 2011-03-02
+==================
+
+* Added options parsing via optimist.
+* Changed code inclusion (thus the version bump).
+
+0.1.0 / 2011-02-27
+==================
+
+* First version of clean-css library.
+* Implemented all basic CSS transformations.
diff --git a/node_modules/clean-css/LICENSE b/node_modules/clean-css/LICENSE
new file mode 100644
index 000000000..bf2f4055b
--- /dev/null
+++ b/node_modules/clean-css/LICENSE
@@ -0,0 +1,19 @@
+Copyright (C) 2017 JakubPawlowicz.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/node_modules/clean-css/README.md b/node_modules/clean-css/README.md
new file mode 100644
index 000000000..a19594801
--- /dev/null
+++ b/node_modules/clean-css/README.md
@@ -0,0 +1,619 @@
+<h1 align="center">
+  <br/>
+  <img src="https://cdn.rawgit.com/jakubpawlowicz/clean-css/master/logo.v2.svg" alt="clean-css logo" width="525px"/>
+  <br/>
+  <br/>
+</h1>
+
+[![NPM version](https://img.shields.io/npm/v/clean-css.svg?style=flat)](https://www.npmjs.com/package/clean-css)
+[![Linux Build Status](https://img.shields.io/travis/jakubpawlowicz/clean-css/master.svg?style=flat&label=Linux%20build)](https://travis-ci.org/jakubpawlowicz/clean-css)
+[![Windows Build status](https://img.shields.io/appveyor/ci/jakubpawlowicz/clean-css/master.svg?style=flat&label=Windows%20build)](https://ci.appveyor.com/project/jakubpawlowicz/clean-css/branch/master)
+[![Dependency Status](https://img.shields.io/david/jakubpawlowicz/clean-css.svg?style=flat)](https://david-dm.org/jakubpawlowicz/clean-css)
+[![NPM Downloads](https://img.shields.io/npm/dm/clean-css.svg)](https://www.npmjs.com/package/clean-css)
+[![Twitter](https://img.shields.io/badge/Twitter-@cleancss-blue.svg)](https://twitter.com/cleancss)
+
+clean-css is a fast and efficient CSS optimizer for [Node.js](http://nodejs.org/) platform and [any modern browser](https://jakubpawlowicz.github.io/clean-css).
+
+According to [tests](http://goalsmashers.github.io/css-minification-benchmark/) it is one of the best available.
+
+**Table of Contents**
+
+- [Node.js version support](#nodejs-version-support)
+- [Install](#install)
+- [Use](#use)
+  * [Important: 4.0 breaking changes](#important-40-breaking-changes)
+  * [Constructor options](#constructor-options)
+  * [Compatibility modes](#compatibility-modes)
+  * [Formatting options](#formatting-options)
+  * [Inlining options](#inlining-options)
+  * [Optimization levels](#optimization-levels)
+    + [Level 0 optimizations](#level-0-optimizations)
+    + [Level 1 optimizations](#level-1-optimizations)
+    + [Level 2 optimizations](#level-2-optimizations)
+  * [Minify method](#minify-method)
+  * [Promise interface](#promise-interface)
+- [FAQ](#faq)
+  * [How to optimize multiple files?](#how-to-optimize-multiple-files)
+  * [How to process remote `@import`s correctly?](#how-to-process-remote-imports-correctly)
+  * [How to apply arbitrary transformations to CSS properties?](#how-to-apply-arbitrary-transformations-to-css-properties)
+  * [How to specify a custom rounding precision?](#how-to-specify-a-custom-rounding-precision)
+  * [How to preserve a comment block?](#how-to-preserve-a-comment-block)
+  * [How to rebase relative image URLs?](#how-to-rebase-relative-image-urls)
+  * [How to work with source maps?](#how-to-work-with-source-maps)
+  * [How to apply level 1 & 2 optimizations at the same time?](#how-to-apply-level-1--2-optimizations-at-the-same-time)
+  * [What level 2 optimizations do?](#what-level-2-optimizations-do)
+  * [How to use clean-css with build tools?](#how-to-use-clean-css-with-build-tools)
+  * [How to use clean-css from web browser?](#how-to-use-clean-css-from-web-browser)
+- [Contributing](#contributing)
+  * [How to get started?](#how-to-get-started)
+- [Acknowledgments](#acknowledgments)
+- [License](#license)
+
+# Node.js version support
+
+clean-css requires Node.js 4.0+ (tested on Linux, OS X, and Windows)
+
+# Install
+
+```
+npm install clean-css
+```
+
+# Use
+
+```js
+var CleanCSS = require('clean-css');
+var input = 'a{font-weight:bold;}';
+var options = { /* options */ };
+var output = new CleanCSS(options).minify(input);
+```
+
+## Important: 4.0 breaking changes
+
+clean-css 4.0 introduces some breaking changes:
+
+* API and CLI interfaces are split, so API stays in this repository while CLI moves to [clean-css-cli](https://github.com/jakubpawlowicz/clean-css-cli);
+* `root`, `relativeTo`, and `target` options are replaced by a single `rebaseTo` option - this means that rebasing URLs and import inlining is much simpler but may not be (YMMV) as powerful as in 3.x;
+* `debug` option is gone as stats are always provided in output object under `stats` property;
+* `roundingPrecision` is disabled by default;
+* `roundingPrecision` applies to **all** units now, not only `px` as in 3.x;
+* `processImport` and `processImportFrom` are merged into `inline` option which defaults to `local`. Remote `@import` rules are **NOT** inlined by default anymore;
+* splits `inliner: { request: ..., timeout: ... }` option into `inlineRequest` and `inlineTimeout` options;
+* remote resources without a protocol, e.g. `//fonts.googleapis.com/css?family=Domine:700`, are not inlined anymore;
+* changes default Internet Explorer compatibility from 9+ to 10+, to revert the old default use `{ compatibility: 'ie9' }` flag;
+* renames `keepSpecialComments` to `specialComments`;
+* moves `roundingPrecision` and `specialComments` to level 1 optimizations options, see examples;
+* moves `mediaMerging`, `restructuring`, `semanticMerging`, and `shorthandCompacting` to level 2 optimizations options, see examples below;
+* renames `shorthandCompacting` option to `mergeIntoShorthands`;
+* level 1 optimizations are the new default, up to 3.x it was level 2;
+* `keepBreaks` option is replaced with `{ format: 'keep-breaks' }` to ease transition;
+* `sourceMap` option has to be a boolean from now on - to specify an input source map pass it a 2nd argument to `minify` method or via a hash instead;
+* `aggressiveMerging` option is removed as aggressive merging is replaced by smarter override merging.
+
+## Constructor options
+
+clean-css constructor accepts a hash as a parameter with the following options available:
+
+* `compatibility` - controls compatibility mode used; defaults to `ie10+`; see [compatibility modes](#compatibility-modes) for examples;
+* `format` - controls output CSS formatting; defaults to `false`; see [formatting options](#formatting-options) for examples;
+* `inline` - controls `@import` inlining rules; defaults to `'local'`; see [inlining options](#inlining-options) for examples;
+* `inlineRequest` - controls extra options for inlining remote `@import` rules, can be any of [HTTP(S) request options](https://nodejs.org/api/http.html#http_http_request_options_callback);
+* `inlineTimeout` - controls number of milliseconds after which inlining a remote `@import` fails; defaults to 5000;
+* `level` - controls optimization level used; defaults to `1`; see [optimization levels](#optimization-levels) for examples;
+* `rebase` - controls URL rebasing; defaults to `true`;
+* `rebaseTo` - controls a directory to which all URLs are rebased, most likely the directory under which the output file will live; defaults to the current directory;
+* `returnPromise` - controls whether `minify` method returns a Promise object or not; defaults to `false`; see [promise interface](#promise-interface) for examples;
+* `sourceMap` - controls whether an output source map is built; defaults to `false`;
+* `sourceMapInlineSources` - controls embedding sources inside a source map's `sourcesContent` field; defaults to false.
+
+## Compatibility modes
+
+There is a certain number of compatibility mode shortcuts, namely:
+
+* `new CleanCSS({ compatibility: '*' })` (default) - Internet Explorer 10+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie9' })` - Internet Explorer 9+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie8' })` - Internet Explorer 8+ compatibility mode
+* `new CleanCSS({ compatibility: 'ie7' })` - Internet Explorer 7+ compatibility mode
+
+Each of these modes is an alias to a [fine grained configuration](https://github.com/jakubpawlowicz/clean-css/blob/master/lib/options/compatibility.js), with the following options available:
+
+```js
+new CleanCSS({
+  compatibility: {
+    colors: {
+      opacity: true // controls `rgba()` / `hsla()` color support
+    },
+    properties: {
+      backgroundClipMerging: true, // controls background-clip merging into shorthand
+      backgroundOriginMerging: true, // controls background-origin merging into shorthand
+      backgroundSizeMerging: true, // controls background-size merging into shorthand
+      colors: true, // controls color optimizations
+      ieBangHack: false, // controls keeping IE bang hack
+      ieFilters: false, // controls keeping IE `filter` / `-ms-filter`
+      iePrefixHack: false, // controls keeping IE prefix hack
+      ieSuffixHack: false, // controls keeping IE suffix hack
+      merging: true, // controls property merging based on understandability
+      shorterLengthUnits: false, // controls shortening pixel units into `pc`, `pt`, or `in` units
+      spaceAfterClosingBrace: true, // controls keeping space after closing brace - `url() no-repeat` into `url()no-repeat`
+      urlQuotes: false, // controls keeping quoting inside `url()`
+      zeroUnits: true // controls removal of units `0` value
+    },
+    selectors: {
+      adjacentSpace: false, // controls extra space before `nav` element
+      ie7Hack: true, // controls removal of IE7 selector hacks, e.g. `*+html...`
+      mergeablePseudoClasses: [':active', ...], // controls a whitelist of mergeable pseudo classes
+      mergeablePseudoElements: ['::after', ...] // controls a whitelist of mergeable pseudo elements
+    },
+    units: {
+      ch: true, // controls treating `ch` as a supported unit
+      in: true, // controls treating `in` as a supported unit
+      pc: true, // controls treating `pc` as a supported unit
+      pt: true, // controls treating `pt` as a supported unit
+      rem: true, // controls treating `rem` as a supported unit
+      vh: true, // controls treating `vh` as a supported unit
+      vm: true, // controls treating `vm` as a supported unit
+      vmax: true, // controls treating `vmax` as a supported unit
+      vmin: true // controls treating `vmin` as a supported unit
+    }
+  }
+})
+```
+
+You can also use a string when setting a compatibility mode, e.g.
+
+```js
+new CleanCSS({
+  compatibility: 'ie9,-properties.merging' // sets compatibility to IE9 mode with disabled property merging
+})
+```
+
+## Formatting options
+
+The `format` option accept the following options:
+
+```js
+new CleanCSS({
+  format: {
+    breaks: { // controls where to insert breaks
+      afterAtRule: false, // controls if a line break comes after an at-rule; e.g. `@charset`; defaults to `false`
+      afterBlockBegins: false, // controls if a line break comes after a block begins; e.g. `@media`; defaults to `false`
+      afterBlockEnds: false, // controls if a line break comes after a block ends, defaults to `false`
+      afterComment: false, // controls if a line break comes after a comment; defaults to `false`
+      afterProperty: false, // controls if a line break comes after a property; defaults to `false`
+      afterRuleBegins: false, // controls if a line break comes after a rule begins; defaults to `false`
+      afterRuleEnds: false, // controls if a line break comes after a rule ends; defaults to `false`
+      beforeBlockEnds: false, // controls if a line break comes before a block ends; defaults to `false`
+      betweenSelectors: false // controls if a line break comes between selectors; defaults to `false`
+    },
+    indentBy: 0, // controls number of characters to indent with; defaults to `0`
+    indentWith: 'space', // controls a character to indent with, can be `'space'` or `'tab'`; defaults to `'space'`
+    spaces: { // controls where to insert spaces
+      aroundSelectorRelation: false, // controls if spaces come around selector relations; e.g. `div > a`; defaults to `false`
+      beforeBlockBegins: false, // controls if a space comes before a block begins; e.g. `.block {`; defaults to `false`
+      beforeValue: false // controls if a space comes before a value; e.g. `width: 1rem`; defaults to `false`
+    },
+    wrapAt: false // controls maximum line length; defaults to `false`
+  }
+})
+```
+
+## Inlining options
+
+`inline` option whitelists which `@import` rules will be processed, e.g.
+
+```js
+new CleanCSS({
+  inline: ['local'] // default
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['all'] // same as ['local', 'remote']
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['local', 'mydomain.example.com']
+})
+```
+
+```js
+new CleanCSS({
+  inline: ['local', 'remote', '!fonts.googleapis.com']
+})
+```
+
+## Optimization levels
+
+The `level` option can be either `0`, `1` (default), or `2`, e.g.
+
+```js
+new CleanCSS({
+  level: 2
+})
+```
+
+or a fine-grained configuration given via a hash.
+
+Please note that level 1 optimization options are generally safe while level 2 optimizations should be safe for most users.
+
+### Level 0 optimizations
+
+Level 0 optimizations simply means "no optimizations". Use it when you'd like to inline imports and / or rebase URLs but skip everything else.
+
+### Level 1 optimizations
+
+Level 1 optimizations (default) operate on single properties only, e.g. can remove units when not required, turn rgb colors to a shorter hex representation, remove comments, etc
+
+Here is a full list of available options:
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      cleanupCharsets: true, // controls `@charset` moving to the front of a stylesheet; defaults to `true`
+      normalizeUrls: true, // controls URL normalization; defaults to `true`
+      optimizeBackground: true, // controls `background` property optimizatons; defaults to `true`
+      optimizeBorderRadius: true, // controls `border-radius` property optimizatons; defaults to `true`
+      optimizeFilter: true, // controls `filter` property optimizatons; defaults to `true`
+      optimizeFont: true, // ontrols `font` property optimizatons; defaults to `true`
+      optimizeFontWeight: true, // controls `font-weight` property optimizatons; defaults to `true`
+      optimizeOutline: true, // controls `outline` property optimizatons; defaults to `true`
+      removeNegativePaddings: true, // controls removing negative paddings; defaults to `true`
+      removeQuotes: true, // controls removing quotes when unnecessary; defaults to `true`
+      removeWhitespace: true, // controls removing unused whitespace; defaults to `true`
+      replaceMultipleZeros: true, // contols removing redundant zeros; defaults to `true`
+      replaceTimeUnits: true, // controls replacing time units with shorter values; defaults to `true`
+      replaceZeroUnits: true, // controls replacing zero values with units; defaults to `true`
+      roundingPrecision: false, // rounds pixel values to `N` decimal places; `false` disables rounding; defaults to `false`
+      selectorsSortingMethod: 'standard', // denotes selector sorting method; can be `natural` or `standard`; defaults to `standard`
+      specialComments: 'all', // denotes a number of /*! ... */ comments preserved; defaults to `all`
+      tidyAtRules: true, // controls at-rules (e.g. `@charset`, `@import`) optimizing; defaults to `true`
+      tidyBlockScopes: true, // controls block scopes (e.g. `@media`) optimizing; defaults to `true`
+      tidySelectors: true, // controls selectors optimizing; defaults to `true`,
+      transform: function () {} // defines a callback for fine-grained property optimization; defaults to no-op
+    }
+  }
+});
+```
+
+There is an `all` shortcut for toggling all options at the same time, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      all: false, // set all values to `false`
+      tidySelectors: true // turns on optimizing selectors
+    }
+  }
+});
+```
+
+### Level 2 optimizations
+
+Level 2 optimizations operate at rules or multiple properties level, e.g. can remove duplicate rules, remove properties redefined further down a stylesheet, or restructure rules by moving them around.
+
+Please note that if level 2 optimizations are turned on then, unless explicitely disabled, level 1 optimizations are applied as well.
+
+Here is a full list of available options:
+
+```js
+new CleanCSS({
+  level: {
+    2: {
+      mergeAdjacentRules: true, // controls adjacent rules merging; defaults to true
+      mergeIntoShorthands: true, // controls merging properties into shorthands; defaults to true
+      mergeMedia: true, // controls `@media` merging; defaults to true
+      mergeNonAdjacentRules: true, // controls non-adjacent rule merging; defaults to true
+      mergeSemantically: false, // controls semantic merging; defaults to false
+      overrideProperties: true, // controls property overriding based on understandability; defaults to true
+      reduceNonAdjacentRules: true, // controls non-adjacent rule reducing; defaults to true
+      removeDuplicateFontRules: true, // controls duplicate `@font-face` removing; defaults to true
+      removeDuplicateMediaBlocks: true, // controls duplicate `@media` removing; defaults to true
+      removeDuplicateRules: true, // controls duplicate rules removing; defaults to true
+      restructureRules: false // controls rule restructuring; defaults to false
+    }
+  }
+});
+```
+
+There is an `all` shortcut for toggling all options at the same time, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    2: {
+      all: false, // sets all values to `false`
+      removeDuplicateRules: true // turns on removing duplicate rules
+    }
+  }
+});
+```
+
+## Minify method
+
+Once configured clean-css provides a `minify` method to optimize a given CSS, e.g.
+
+```js
+var output = new CleanCSS(options).minify(source);
+```
+
+The output of the `minify` method is a hash with following fields:
+
+```js
+console.log(output.styles); // optimized output CSS as a string
+console.log(output.sourceMap); // output source map if requested with `sourceMap` option
+console.log(output.errors); // a list of errors raised
+console.log(output.warnings); // a list of warnings raised
+console.log(output.stats.originalSize); // original content size after import inlining
+console.log(output.stats.minifiedSize); // optimized content size
+console.log(output.stats.timeSpent); // time spent on optimizations in milliseconds
+console.log(output.stats.efficiency); // a ratio of output size to input size (e.g. 25% if content was reduced from 100 bytes to 75 bytes)
+```
+
+The `minify` method also accepts an input source map, e.g.
+
+```js
+var output = new CleanCSS(options).minify(source, inputSourceMap);
+```
+
+or a callback invoked when optimizations are finished, e.g.
+
+```js
+new CleanCSS(options).minify(source, function (error, output) {
+  // `output` is the same as in the synchronous call above
+});
+```
+
+## Promise interface
+
+If you prefer clean-css to return a Promise object then you need to explicitely ask for it, e.g.
+
+```js
+new CleanCSS({ returnPromise: true })
+  .minify(source)
+  .then(function (output) { console.log(output.styles); })
+  .catch(function (error) { // deal with errors });
+```
+
+# FAQ
+
+## How to optimize multiple files?
+
+It can be done either by passing an array of paths, or, when sources are already available, a hash:
+
+```js
+new CleanCSS().minify(['path/to/file/one', 'path/to/file/two']);
+```
+
+```js
+new CleanCSS().minify({
+  'path/to/file/one': {
+    styles: 'contents of file one'
+  },
+  'path/to/file/two': {
+    styles: 'contents of file two'
+  }
+});
+```
+
+Important note - any `@import` rules already present in the hash will be resolved in memory.
+
+## How to process remote `@import`s correctly?
+
+In order to inline remote `@import` statements you need to provide a callback to minify method as fetching remote assets is an asynchronous operation, e.g.:
+
+```js
+var source = '@import url(http://example.com/path/to/remote/styles);';
+new CleanCSS({ inline: ['remote'] }).minify(source, function (error, output) {
+  // output.styles
+});
+```
+
+If you don't provide a callback, then remote `@import`s will be left as is.
+
+## How to apply arbitrary transformations to CSS properties?
+
+If clean-css doesn't perform a particular property optimization, you can use `transform` callback to apply it:
+
+```js
+var source = '.block{background-image:url(/path/to/image.png)}';
+var output = new CleanCSS({
+  level: {
+    1: {
+      transform: function (propertyName, propertyValue) {
+        if (propertyName == 'background-image' && propertyValue.indexOf('/path/to') > -1) {
+          return propertyValue.replace('/path/to', '../valid/path/to');
+        }
+      }
+    }
+  }
+}).minify(source);
+
+console.log(output.styles); # => .block{background-image:url(../valid/path/to/image.png)}
+```
+
+Note: returning `false` from `transform` callback will drop a property.
+
+## How to specify a custom rounding precision?
+
+The level 1 `roundingPrecision` optimization option accept a string with per-unit rounding precision settings, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      roundingPrecision: 'all=3,px=5'
+    }
+  }
+}).minify(source)
+```
+
+which sets all units rounding precision to 3 digits except `px` unit precision of 5 digits.
+
+## How to preserve a comment block?
+
+Use the `/*!` notation instead of the standard one `/*`:
+
+```css
+/*!
+  Important comments included in optimized output.
+*/
+```
+
+## How to rebase relative image URLs?
+
+clean-css will handle it automatically for you in the following cases:
+
+* when full paths to input files are passed in as options;
+* when correct paths are passed in via a hash;
+* when `rebaseTo` is used with any of above two.
+
+## How to work with source maps?
+
+To generate a source map, use `sourceMap: true` option, e.g.:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
+  .minify(source, function (error, output) {
+    // access output.sourceMap for SourceMapGenerator object
+    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
+});
+```
+
+You can also pass an input source map directly as a 2nd argument to `minify` method:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
+  .minify(source, inputSourceMap, function (error, output) {
+    // access output.sourceMap to access SourceMapGenerator object
+    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
+});
+```
+
+or even multiple input source maps at once:
+
+```js
+new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory }).minify({
+  'path/to/source/1': {
+    styles: '...styles...',
+    sourceMap: '...source-map...'
+  },
+  'path/to/source/2': {
+    styles: '...styles...',
+    sourceMap: '...source-map...'
+  }
+}, function (error, output) {
+  // access output.sourceMap as above
+});
+```
+
+## How to apply level 1 & 2 optimizations at the same time?
+
+Using the hash configuration specifying both optimization levels, e.g.
+
+```js
+new CleanCSS({
+  level: {
+    1: {
+      all: true,
+      normalizeUrls: false
+    },
+    2: {
+      restructureRules: true
+    }
+  }
+})
+```
+
+will apply level 1 optimizations, except url normalization, and default level 2 optimizations with rule restructuring.
+
+## What level 2 optimizations do?
+
+All level 2 optimizations are dispatched [here](https://github.com/jakubpawlowicz/clean-css/blob/master/lib/optimizer/level-2/optimize.js#L67), and this is what they do:
+
+* `recursivelyOptimizeBlocks` - does all the following operations on a nested block, like `@media` or `@keyframe`;
+* `recursivelyOptimizeProperties` - optimizes properties in rulesets and flat at-rules, like @font-face, by splitting them into components (e.g. `margin` into `margin-(bottom|left|right|top)`), optimizing, and restoring them back. You may want to use `mergeIntoShorthands` option to control whether you want to turn multiple components into shorthands;
+* `removeDuplicates` - gets rid of duplicate rulesets with exactly the same set of properties, e.g. when including a Sass / Less partial twice for no good reason;
+* `mergeAdjacent` - merges adjacent rulesets with the same selector or rules;
+* `reduceNonAdjacent` - identifies which properties are overridden in same-selector non-adjacent rulesets, and removes them;
+* `mergeNonAdjacentBySelector` - identifies same-selector non-adjacent rulesets which can be moved (!) to be merged, requires all intermediate rulesets to not redefine the moved properties, or if redefined to have the same value;
+* `mergeNonAdjacentByBody` - same as the one above but for same-selector non-adjacent rulesets;
+* `restructure` - tries to reorganize different-selector different-rules rulesets so they take less space, e.g. `.one{padding:0}.two{margin:0}.one{margin-bottom:3px}` into `.two{margin:0}.one{padding:0;margin-bottom:3px}`;
+* `removeDuplicateFontAtRules` - removes duplicated `@font-face` rules;
+* `removeDuplicateMediaQueries` - removes duplicated `@media` nested blocks;
+* `mergeMediaQueries` - merges non-adjacent `@media` at-rules by the same rules as `mergeNonAdjacentBy*` above;
+
+## How to use clean-css with build tools?
+
+There is a number of 3rd party plugins to popular build tools:
+
+* [Broccoli](https://github.com/broccolijs/broccoli#broccoli): [broccoli-clean-css](https://github.com/shinnn/broccoli-clean-css)
+* [Brunch](http://brunch.io/): [clean-css-brunch](https://github.com/brunch/clean-css-brunch)
+* [Grunt](http://gruntjs.com): [grunt-contrib-cssmin](https://github.com/gruntjs/grunt-contrib-cssmin)
+* [Gulp](http://gulpjs.com/): [gulp-clean-css](https://github.com/scniro/gulp-clean-css)
+* [Gulp](http://gulpjs.com/): [using vinyl-map as a wrapper - courtesy of @sogko](https://github.com/jakubpawlowicz/clean-css/issues/342)
+* [component-builder2](https://github.com/component/builder2.js): [builder-clean-css](https://github.com/poying/builder-clean-css)
+* [Metalsmith](http://metalsmith.io): [metalsmith-clean-css](https://github.com/aymericbeaumet/metalsmith-clean-css)
+* [Lasso](https://github.com/lasso-js/lasso): [lasso-clean-css](https://github.com/yomed/lasso-clean-css)
+* [Start](https://github.com/start-runner/start): [start-clean-css](https://github.com/start-runner/clean-css)
+
+## How to use clean-css from web browser?
+
+* https://jakubpawlowicz.github.io/clean-css/ (official web interface)
+* http://refresh-sf.com/
+* http://adamburgess.github.io/clean-css-online/
+
+# Contributing
+
+See [CONTRIBUTING.md](https://github.com/jakubpawlowicz/clean-css/blob/master/CONTRIBUTING.md).
+
+## How to get started?
+
+First clone the sources:
+
+```bash
+git clone git@github.com:jakubpawlowicz/clean-css.git
+```
+
+then install dependencies:
+
+```bash
+cd clean-css
+npm install
+```
+
+then use any of the following commands to verify your copy:
+
+```bash
+npm run bench # for clean-css benchmarks (see [test/bench.js](https://github.com/jakubpawlowicz/clean-css/blob/master/test/bench.js) for details)
+npm run browserify # to create the browser-ready clean-css version
+npm run check # to lint JS sources with [JSHint](https://github.com/jshint/jshint/)
+npm test # to run all tests
+```
+
+# Acknowledgments
+
+Sorted alphabetically by GitHub handle:
+
+* [@abarre](https://github.com/abarre) (Anthony Barre) for improvements to `@import` processing;
+* [@alexlamsl](https://github.com/alexlamsl) (Alex Lam S.L.) for testing early clean-css 4 versions, reporting bugs, and suggesting numerous improvements.
+* [@altschuler](https://github.com/altschuler) (Simon Altschuler) for fixing `@import` processing inside comments;
+* [@ben-eb](https://github.com/ben-eb) (Ben Briggs) for sharing ideas about CSS optimizations;
+* [@facelessuser](https://github.com/facelessuser) (Isaac) for pointing out a flaw in clean-css' stateless mode;
+* [@jmalonzo](https://github.com/jmalonzo) (Jan Michael Alonzo) for a patch removing node.js' old `sys` package;
+* [@lukeapage](https://github.com/lukeapage) (Luke Page) for suggestions and testing the source maps feature;
+  Plus everyone else involved in [#125](https://github.com/jakubpawlowicz/clean-css/issues/125) for pushing it forward;
+* [@madwizard-thomas](https://github.com/madwizard-thomas) for sharing ideas about `@import` inlining and URL rebasing.
+* [@ngyikp](https://github.com/ngyikp) (Ng Yik Phang) for testing early clean-css 4 versions, reporting bugs, and suggesting numerous improvements.
+* [@wagenet](https://github.com/wagenet) (Peter Wagenet) for suggesting improvements to `@import` inlining behavior;
+* [@venemo](https://github.com/venemo) (Timur Kristóf) for an outstanding contribution of advanced property optimizer for 2.2 release;
+* [@vvo](https://github.com/vvo) (Vincent Voyer) for a patch with better empty element regex and for inspiring us to do many performance improvements in 0.4 release;
+* [@xhmikosr](https://github.com/xhmikosr) for suggesting new features, like option to remove special comments and strip out URLs quotation, and pointing out numerous improvements like JSHint, media queries, etc.
+
+# License
+
+clean-css is released under the [MIT License](https://github.com/jakubpawlowicz/clean-css/blob/master/LICENSE).
diff --git a/node_modules/clean-css/index.js b/node_modules/clean-css/index.js
new file mode 100644
index 000000000..d7b05030f
--- /dev/null
+++ b/node_modules/clean-css/index.js
@@ -0,0 +1 @@
+module.exports = require('./lib/clean');
diff --git a/node_modules/clean-css/lib/clean.js b/node_modules/clean-css/lib/clean.js
new file mode 100644
index 000000000..f8268777b
--- /dev/null
+++ b/node_modules/clean-css/lib/clean.js
@@ -0,0 +1,154 @@
+/**
+ * Clean-css - https://github.com/jakubpawlowicz/clean-css
+ * Released under the terms of MIT license
+ *
+ * Copyright (C) 2017 JakubPawlowicz.com
+ */
+
+var level0Optimize = require('./optimizer/level-0/optimize');
+var level1Optimize = require('./optimizer/level-1/optimize');
+var level2Optimize = require('./optimizer/level-2/optimize');
+var validator = require('./optimizer/validator');
+
+var compatibilityFrom = require('./options/compatibility');
+var formatFrom = require('./options/format').formatFrom;
+var inlineFrom = require('./options/inline');
+var inlineRequestFrom = require('./options/inline-request');
+var inlineTimeoutFrom = require('./options/inline-timeout');
+var OptimizationLevel = require('./options/optimization-level').OptimizationLevel;
+var optimizationLevelFrom = require('./options/optimization-level').optimizationLevelFrom;
+var rebaseFrom = require('./options/rebase');
+var rebaseToFrom = require('./options/rebase-to');
+
+var inputSourceMapTracker = require('./reader/input-source-map-tracker');
+var readSources = require('./reader/read-sources');
+
+var serializeStyles = require('./writer/simple');
+var serializeStylesAndSourceMap = require('./writer/source-maps');
+
+var CleanCSS = module.exports = function CleanCSS(options) {
+  options = options || {};
+
+  this.options = {
+    compatibility: compatibilityFrom(options.compatibility),
+    format: formatFrom(options.format),
+    inline: inlineFrom(options.inline),
+    inlineRequest: inlineRequestFrom(options.inlineRequest),
+    inlineTimeout: inlineTimeoutFrom(options.inlineTimeout),
+    level: optimizationLevelFrom(options.level),
+    rebase: rebaseFrom(options.rebase),
+    rebaseTo: rebaseToFrom(options.rebaseTo),
+    returnPromise: !!options.returnPromise,
+    sourceMap: !!options.sourceMap,
+    sourceMapInlineSources: !!options.sourceMapInlineSources
+  };
+};
+
+CleanCSS.prototype.minify = function (input, maybeSourceMap, maybeCallback) {
+  var options = this.options;
+
+  if (options.returnPromise) {
+    return new Promise(function (resolve, reject) {
+      minify(input, options, maybeSourceMap, function (errors, output) {
+        return errors ?
+          reject(errors) :
+          resolve(output);
+      });
+    });
+  } else {
+    return minify(input, options, maybeSourceMap, maybeCallback);
+  }
+};
+
+function minify(input, options, maybeSourceMap, maybeCallback) {
+  var sourceMap = typeof maybeSourceMap != 'function' ?
+    maybeSourceMap :
+    null;
+  var callback = typeof maybeCallback == 'function' ?
+    maybeCallback :
+    (typeof maybeSourceMap == 'function' ? maybeSourceMap : null);
+  var context = {
+    stats: {
+      efficiency: 0,
+      minifiedSize: 0,
+      originalSize: 0,
+      startedAt: Date.now(),
+      timeSpent: 0
+    },
+    cache: {
+      specificity: {}
+    },
+    errors: [],
+    inlinedStylesheets: [],
+    inputSourceMapTracker: inputSourceMapTracker(),
+    localOnly: !callback,
+    options: options,
+    source: null,
+    sourcesContent: {},
+    validator: validator(options.compatibility),
+    warnings: []
+  };
+
+  if (sourceMap) {
+    context.inputSourceMapTracker.track(undefined, sourceMap);
+  }
+
+  return runner(context.localOnly)(function () {
+    return readSources(input, context, function (tokens) {
+      var serialize = context.options.sourceMap ?
+        serializeStylesAndSourceMap :
+        serializeStyles;
+
+      var optimizedTokens = optimize(tokens, context);
+      var optimizedStyles = serialize(optimizedTokens, context);
+      var output = withMetadata(optimizedStyles, context);
+
+      return callback ?
+        callback(context.errors.length > 0 ? context.errors : null, output) :
+        output;
+    });
+  });
+}
+
+function runner(localOnly) {
+  // to always execute code asynchronously when a callback is given
+  // more at blog.izs.me/post/59142742143/designing-apis-for-asynchrony
+  return localOnly ?
+    function (callback) { return callback(); } :
+    process.nextTick;
+}
+
+function optimize(tokens, context) {
+  var optimized;
+
+  optimized = level0Optimize(tokens, context);
+  optimized = OptimizationLevel.One in context.options.level ?
+    level1Optimize(tokens, context) :
+    tokens;
+  optimized = OptimizationLevel.Two in context.options.level ?
+    level2Optimize(tokens, context, true) :
+    optimized;
+
+  return optimized;
+}
+
+function withMetadata(output, context) {
+  output.stats = calculateStatsFrom(output.styles, context);
+  output.errors = context.errors;
+  output.inlinedStylesheets = context.inlinedStylesheets;
+  output.warnings = context.warnings;
+
+  return output;
+}
+
+function calculateStatsFrom(styles, context) {
+  var finishedAt = Date.now();
+  var timeSpent = finishedAt - context.stats.startedAt;
+
+  delete context.stats.startedAt;
+  context.stats.timeSpent = timeSpent;
+  context.stats.efficiency = 1 - styles.length / context.stats.originalSize;
+  context.stats.minifiedSize = styles.length;
+
+  return context.stats;
+}
diff --git a/node_modules/clean-css/lib/optimizer/hack.js b/node_modules/clean-css/lib/optimizer/hack.js
new file mode 100644
index 000000000..812b5d5ec
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/hack.js
@@ -0,0 +1,8 @@
+var Hack = {
+  ASTERISK: 'asterisk',
+  BANG: 'bang',
+  BACKSLASH: 'backslash',
+  UNDERSCORE: 'underscore'
+};
+
+module.exports = Hack;
diff --git a/node_modules/clean-css/lib/optimizer/level-0/optimize.js b/node_modules/clean-css/lib/optimizer/level-0/optimize.js
new file mode 100644
index 000000000..2a56f89c6
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-0/optimize.js
@@ -0,0 +1,6 @@
+function level0Optimize(tokens) {
+  // noop as level 0 means no optimizations!
+  return tokens;
+}
+
+module.exports = level0Optimize;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/optimize.js b/node_modules/clean-css/lib/optimizer/level-1/optimize.js
new file mode 100644
index 000000000..e7a9bbb47
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/optimize.js
@@ -0,0 +1,734 @@
+var shortenHex = require('./shorten-hex');
+var shortenHsl = require('./shorten-hsl');
+var shortenRgb = require('./shorten-rgb');
+var sortSelectors = require('./sort-selectors');
+var tidyRules = require('./tidy-rules');
+var tidyBlock = require('./tidy-block');
+var tidyAtRule = require('./tidy-at-rule');
+
+var Hack = require('../hack');
+var removeUnused = require('../remove-unused');
+var restoreFromOptimizing = require('../restore-from-optimizing');
+var wrapForOptimizing = require('../wrap-for-optimizing').all;
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var Token = require('../../tokenizer/token');
+var Marker = require('../../tokenizer/marker');
+
+var formatPosition = require('../../utils/format-position');
+var split = require('../../utils/split');
+
+var IgnoreProperty = 'ignore-property';
+
+var CHARSET_TOKEN = '@charset';
+var CHARSET_REGEXP = new RegExp('^' + CHARSET_TOKEN, 'i');
+
+var DEFAULT_ROUNDING_PRECISION = require('../../options/rounding-precision').DEFAULT;
+
+var FONT_NUMERAL_WEIGHTS = ['100', '200', '300', '400', '500', '600', '700', '800', '900'];
+var FONT_NAME_WEIGHTS = ['normal', 'bold', 'bolder', 'lighter'];
+var FONT_NAME_WEIGHTS_WITHOUT_NORMAL = ['bold', 'bolder', 'lighter'];
+
+var WHOLE_PIXEL_VALUE = /(?:^|\s|\()(-?\d+)px/;
+var TIME_VALUE = /^(\-?[\d\.]+)(m?s)$/;
+
+var PROPERTY_NAME_PATTERN = /^(?:\-chrome\-|\-[\w\-]+\w|\w[\w\-]+\w|\-\-\S+)$/;
+var IMPORT_PREFIX_PATTERN = /^@import/i;
+var QUOTED_PATTERN = /^('.*'|".*")$/;
+var QUOTED_BUT_SAFE_PATTERN = /^['"][a-zA-Z][a-zA-Z\d\-_]+['"]$/;
+var URL_PREFIX_PATTERN = /^url\(/i;
+var VARIABLE_NAME_PATTERN = /^--\S+$/;
+
+function isNegative(value) {
+  return value && value[1][0] == '-' && parseFloat(value[1]) < 0;
+}
+
+function isQuoted(value) {
+  return QUOTED_PATTERN.test(value);
+}
+
+function isUrl(value) {
+  return URL_PREFIX_PATTERN.test(value);
+}
+
+function normalizeUrl(value) {
+  return value
+    .replace(URL_PREFIX_PATTERN, 'url(')
+    .replace(/\\?\n|\\?\r\n/g, '');
+}
+
+function optimizeBackground(property) {
+  var values = property.value;
+
+  if (values.length == 1 && values[0][1] == 'none') {
+    values[0][1] = '0 0';
+  }
+
+  if (values.length == 1 && values[0][1] == 'transparent') {
+    values[0][1] = '0 0';
+  }
+}
+
+function optimizeBorderRadius(property) {
+  var values = property.value;
+  var spliceAt;
+
+  if (values.length == 3 && values[1][1] == '/' && values[0][1] == values[2][1]) {
+    spliceAt = 1;
+  } else if (values.length == 5 && values[2][1] == '/' && values[0][1] == values[3][1] && values[1][1] == values[4][1]) {
+    spliceAt = 2;
+  } else if (values.length == 7 && values[3][1] == '/' && values[0][1] == values[4][1] && values[1][1] == values[5][1] && values[2][1] == values[6][1]) {
+    spliceAt = 3;
+  } else if (values.length == 9 && values[4][1] == '/' && values[0][1] == values[5][1] && values[1][1] == values[6][1] && values[2][1] == values[7][1] && values[3][1] == values[8][1]) {
+    spliceAt = 4;
+  }
+
+  if (spliceAt) {
+    property.value.splice(spliceAt);
+    property.dirty = true;
+  }
+}
+
+function optimizeColors(name, value, compatibility) {
+  if (value.indexOf('#') === -1 && value.indexOf('rgb') == -1 && value.indexOf('hsl') == -1) {
+    return shortenHex(value);
+  }
+
+  value = value
+    .replace(/rgb\((\-?\d+),(\-?\d+),(\-?\d+)\)/g, function (match, red, green, blue) {
+      return shortenRgb(red, green, blue);
+    })
+    .replace(/hsl\((-?\d+),(-?\d+)%?,(-?\d+)%?\)/g, function (match, hue, saturation, lightness) {
+      return shortenHsl(hue, saturation, lightness);
+    })
+    .replace(/(^|[^='"])#([0-9a-f]{6})/gi, function (match, prefix, color) {
+      if (color[0] == color[1] && color[2] == color[3] && color[4] == color[5]) {
+        return (prefix + '#' + color[0] + color[2] + color[4]).toLowerCase();
+      } else {
+        return (prefix + '#' + color).toLowerCase();
+      }
+    })
+    .replace(/(^|[^='"])#([0-9a-f]{3})/gi, function (match, prefix, color) {
+      return prefix + '#' + color.toLowerCase();
+    })
+    .replace(/(rgb|rgba|hsl|hsla)\(([^\)]+)\)/g, function (match, colorFunction, colorDef) {
+      var tokens = colorDef.split(',');
+      var applies = (colorFunction == 'hsl' && tokens.length == 3) ||
+        (colorFunction == 'hsla' && tokens.length == 4) ||
+        (colorFunction == 'rgb' && tokens.length == 3 && colorDef.indexOf('%') > 0) ||
+        (colorFunction == 'rgba' && tokens.length == 4 && colorDef.indexOf('%') > 0);
+
+      if (!applies) {
+        return match;
+      }
+
+      if (tokens[1].indexOf('%') == -1) {
+        tokens[1] += '%';
+      }
+
+      if (tokens[2].indexOf('%') == -1) {
+        tokens[2] += '%';
+      }
+
+      return colorFunction + '(' + tokens.join(',') + ')';
+    });
+
+  if (compatibility.colors.opacity && name.indexOf('background') == -1) {
+    value = value.replace(/(?:rgba|hsla)\(0,0%?,0%?,0\)/g, function (match) {
+      if (split(value, ',').pop().indexOf('gradient(') > -1) {
+        return match;
+      }
+
+      return 'transparent';
+    });
+  }
+
+  return shortenHex(value);
+}
+
+function optimizeFilter(property) {
+  if (property.value.length == 1) {
+    property.value[0][1] = property.value[0][1].replace(/progid:DXImageTransform\.Microsoft\.(Alpha|Chroma)(\W)/, function (match, filter, suffix) {
+      return filter.toLowerCase() + suffix;
+    });
+  }
+
+  property.value[0][1] = property.value[0][1]
+    .replace(/,(\S)/g, ', $1')
+    .replace(/ ?= ?/g, '=');
+}
+
+function optimizeFont(property, options) {
+  var values = property.value;
+  var hasNumeral = FONT_NUMERAL_WEIGHTS.indexOf(values[0][1]) > -1 ||
+    values[1] && FONT_NUMERAL_WEIGHTS.indexOf(values[1][1]) > -1 ||
+    values[2] && FONT_NUMERAL_WEIGHTS.indexOf(values[2][1]) > -1;
+  var canOptimizeFontWeight = options.level[OptimizationLevel.One].optimizeFontWeight;
+  var normalCount = 0;
+  var toOptimize;
+
+  if (!canOptimizeFontWeight) {
+    return;
+  }
+
+  if (hasNumeral) {
+    return;
+  }
+
+  if (values[1] && values[1][1] == '/') {
+    return;
+  }
+
+  if (values[0][1] == 'normal') {
+    normalCount++;
+  }
+
+  if (values[1] && values[1][1] == 'normal') {
+    normalCount++;
+  }
+
+  if (values[2] && values[2][1] == 'normal') {
+    normalCount++;
+  }
+
+  if (normalCount > 1) {
+    return;
+  }
+
+  if (FONT_NAME_WEIGHTS_WITHOUT_NORMAL.indexOf(values[0][1]) > -1) {
+    toOptimize = 0;
+  } else if (values[1] && FONT_NAME_WEIGHTS_WITHOUT_NORMAL.indexOf(values[1][1]) > -1) {
+    toOptimize = 1;
+  } else if (values[2] && FONT_NAME_WEIGHTS_WITHOUT_NORMAL.indexOf(values[2][1]) > -1) {
+    toOptimize = 2;
+  } else if (FONT_NAME_WEIGHTS.indexOf(values[0][1]) > -1) {
+    toOptimize = 0;
+  } else if (values[1] && FONT_NAME_WEIGHTS.indexOf(values[1][1]) > -1) {
+    toOptimize = 1;
+  } else if (values[2] && FONT_NAME_WEIGHTS.indexOf(values[2][1]) > -1) {
+    toOptimize = 2;
+  }
+
+  if (toOptimize !== undefined && canOptimizeFontWeight) {
+    optimizeFontWeight(property, toOptimize);
+    property.dirty = true;
+  }
+}
+
+function optimizeFontWeight(property, atIndex) {
+  var value = property.value[atIndex][1];
+
+  if (value == 'normal') {
+    value = '400';
+  } else if (value == 'bold') {
+    value = '700';
+  }
+
+  property.value[atIndex][1] = value;
+}
+
+function optimizeMultipleZeros(property) {
+  var values = property.value;
+  var spliceAt;
+
+  if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
+    if (property.name.indexOf('box-shadow') > -1) {
+      spliceAt = 2;
+    } else {
+      spliceAt = 1;
+    }
+  }
+
+  if (spliceAt) {
+    property.value.splice(spliceAt);
+    property.dirty = true;
+  }
+}
+
+function optimizeOutline(property) {
+  var values = property.value;
+
+  if (values.length == 1 && values[0][1] == 'none') {
+    values[0][1] = '0';
+  }
+}
+
+function optimizePixelLengths(_, value, compatibility) {
+  if (!WHOLE_PIXEL_VALUE.test(value)) {
+    return value;
+  }
+
+  return value.replace(WHOLE_PIXEL_VALUE, function (match, val) {
+    var newValue;
+    var intVal = parseInt(val);
+
+    if (intVal === 0) {
+      return match;
+    }
+
+    if (compatibility.properties.shorterLengthUnits && compatibility.units.pt && intVal * 3 % 4 === 0) {
+      newValue = intVal * 3 / 4 + 'pt';
+    }
+
+    if (compatibility.properties.shorterLengthUnits && compatibility.units.pc && intVal % 16 === 0) {
+      newValue = intVal / 16 + 'pc';
+    }
+
+    if (compatibility.properties.shorterLengthUnits && compatibility.units.in && intVal % 96 === 0) {
+      newValue = intVal / 96 + 'in';
+    }
+
+    if (newValue) {
+      newValue = match.substring(0, match.indexOf(val)) + newValue;
+    }
+
+    return newValue && newValue.length < match.length ? newValue : match;
+  });
+}
+
+function optimizePrecision(_, value, precisionOptions) {
+  if (!precisionOptions.enabled || value.indexOf('.') === -1) {
+    return value;
+  }
+
+  return value
+    .replace(precisionOptions.decimalPointMatcher, '$1$2$3')
+    .replace(precisionOptions.zeroMatcher, function (match, integerPart, fractionPart, unit) {
+      var multiplier = precisionOptions.units[unit].multiplier;
+      var parsedInteger = parseInt(integerPart);
+      var integer = isNaN(parsedInteger) ? 0 : parsedInteger;
+      var fraction = parseFloat(fractionPart);
+
+      return Math.round((integer + fraction) * multiplier) / multiplier + unit;
+    });
+}
+
+function optimizeTimeUnits(_, value) {
+  if (!TIME_VALUE.test(value))
+    return value;
+
+  return value.replace(TIME_VALUE, function (match, val, unit) {
+    var newValue;
+
+    if (unit == 'ms') {
+      newValue = parseInt(val) / 1000 + 's';
+    } else if (unit == 's') {
+      newValue = parseFloat(val) * 1000 + 'ms';
+    }
+
+    return newValue.length < match.length ? newValue : match;
+  });
+}
+
+function optimizeUnits(name, value, unitsRegexp) {
+  if (/^(?:\-moz\-calc|\-webkit\-calc|calc|rgb|hsl|rgba|hsla)\(/.test(value)) {
+    return value;
+  }
+
+  if (name == 'flex' || name == '-ms-flex' || name == '-webkit-flex' || name == 'flex-basis' || name == '-webkit-flex-basis') {
+    return value;
+  }
+
+  if (value.indexOf('%') > 0 && (name == 'height' || name == 'max-height')) {
+    return value;
+  }
+
+  return value
+    .replace(unitsRegexp, '$1' + '0' + '$2')
+    .replace(unitsRegexp, '$1' + '0' + '$2');
+}
+
+function optimizeWhitespace(name, value) {
+  if (name.indexOf('filter') > -1 || value.indexOf(' ') == -1 || value.indexOf('expression') === 0) {
+    return value;
+  }
+
+  if (value.indexOf(Marker.SINGLE_QUOTE) > -1 || value.indexOf(Marker.DOUBLE_QUOTE) > -1) {
+    return value;
+  }
+
+  value = value.replace(/\s+/g, ' ');
+
+  if (value.indexOf('calc') > -1) {
+    value = value.replace(/\) ?\/ ?/g, ')/ ');
+  }
+
+  return value
+    .replace(/(\(;?)\s+/g, '$1')
+    .replace(/\s+(;?\))/g, '$1')
+    .replace(/, /g, ',');
+}
+
+function optimizeZeroDegUnit(_, value) {
+  if (value.indexOf('0deg') == -1) {
+    return value;
+  }
+
+  return value.replace(/\(0deg\)/g, '(0)');
+}
+
+function optimizeZeroUnits(name, value) {
+  if (value.indexOf('0') == -1) {
+    return value;
+  }
+
+  if (value.indexOf('-') > -1) {
+    value = value
+      .replace(/([^\w\d\-]|^)\-0([^\.]|$)/g, '$10$2')
+      .replace(/([^\w\d\-]|^)\-0([^\.]|$)/g, '$10$2');
+  }
+
+  return value
+    .replace(/(^|\s)0+([1-9])/g, '$1$2')
+    .replace(/(^|\D)\.0+(\D|$)/g, '$10$2')
+    .replace(/(^|\D)\.0+(\D|$)/g, '$10$2')
+    .replace(/\.([1-9]*)0+(\D|$)/g, function (match, nonZeroPart, suffix) {
+      return (nonZeroPart.length > 0 ? '.' : '') + nonZeroPart + suffix;
+    })
+    .replace(/(^|\D)0\.(\d)/g, '$1.$2');
+}
+
+function removeQuotes(name, value) {
+  if (name == 'content' || name.indexOf('font-feature-settings') > -1 || name.indexOf('grid-') > -1) {
+    return value;
+  }
+
+  return QUOTED_BUT_SAFE_PATTERN.test(value) ?
+    value.substring(1, value.length - 1) :
+    value;
+}
+
+function removeUrlQuotes(value) {
+  return /^url\(['"].+['"]\)$/.test(value) && !/^url\(['"].*[\*\s\(\)'"].*['"]\)$/.test(value) && !/^url\(['"]data:[^;]+;charset/.test(value) ?
+    value.replace(/["']/g, '') :
+    value;
+}
+
+function transformValue(propertyName, propertyValue, transformCallback) {
+  var transformedValue = transformCallback(propertyName, propertyValue);
+
+  if (transformedValue === undefined) {
+    return propertyValue;
+  } else if (transformedValue === false) {
+    return IgnoreProperty;
+  } else {
+    return transformedValue;
+  }
+}
+
+//
+
+function optimizeBody(properties, context) {
+  var options = context.options;
+  var levelOptions = options.level[OptimizationLevel.One];
+  var property, name, type, value;
+  var valueIsUrl;
+  var propertyToken;
+  var _properties = wrapForOptimizing(properties, true);
+
+  propertyLoop:
+  for (var i = 0, l = _properties.length; i < l; i++) {
+    property = _properties[i];
+    name = property.name;
+
+    if (!PROPERTY_NAME_PATTERN.test(name)) {
+      propertyToken = property.all[property.position];
+      context.warnings.push('Invalid property name \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
+      property.unused = true;
+    }
+
+    if (property.value.length === 0) {
+      propertyToken = property.all[property.position];
+      context.warnings.push('Empty property \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
+      property.unused = true;
+    }
+
+    if (property.hack && (
+        (property.hack[0] == Hack.ASTERISK || property.hack[0] == Hack.UNDERSCORE) && !options.compatibility.properties.iePrefixHack ||
+        property.hack[0] == Hack.BACKSLASH && !options.compatibility.properties.ieSuffixHack ||
+        property.hack[0] == Hack.BANG && !options.compatibility.properties.ieBangHack)) {
+      property.unused = true;
+    }
+
+    if (levelOptions.removeNegativePaddings && name.indexOf('padding') === 0 && (isNegative(property.value[0]) || isNegative(property.value[1]) || isNegative(property.value[2]) || isNegative(property.value[3]))) {
+      property.unused = true;
+    }
+
+    if (!options.compatibility.properties.ieFilters && isLegacyFilter(property)) {
+      property.unused = true;
+    }
+
+    if (property.unused) {
+      continue;
+    }
+
+    if (property.block) {
+      optimizeBody(property.value[0][1], context);
+      continue;
+    }
+
+    if (VARIABLE_NAME_PATTERN.test(name)) {
+      continue;
+    }
+
+    for (var j = 0, m = property.value.length; j < m; j++) {
+      type = property.value[j][0];
+      value = property.value[j][1];
+      valueIsUrl = isUrl(value);
+
+      if (type == Token.PROPERTY_BLOCK) {
+        property.unused = true;
+        context.warnings.push('Invalid value token at ' + formatPosition(value[0][1][2][0]) + '. Ignoring.');
+        break;
+      }
+
+      if (valueIsUrl && !context.validator.isValidUrl(value)) {
+        property.unused = true;
+        context.warnings.push('Broken URL \'' + value + '\' at ' + formatPosition(property.value[j][2][0]) + '. Ignoring.');
+        break;
+      }
+
+      if (valueIsUrl) {
+        value = levelOptions.normalizeUrls ?
+          normalizeUrl(value) :
+          value;
+        value = !options.compatibility.properties.urlQuotes ?
+          removeUrlQuotes(value) :
+          value;
+      } else if (isQuoted(value)) {
+        value = levelOptions.removeQuotes ?
+          removeQuotes(name, value) :
+          value;
+      } else {
+        value = levelOptions.removeWhitespace ?
+          optimizeWhitespace(name, value) :
+          value;
+        value = optimizePrecision(name, value, options.precision);
+        value = optimizePixelLengths(name, value, options.compatibility);
+        value = levelOptions.replaceTimeUnits ?
+          optimizeTimeUnits(name, value) :
+          value;
+        value = levelOptions.replaceZeroUnits ?
+          optimizeZeroUnits(name, value) :
+          value;
+
+        if (options.compatibility.properties.zeroUnits) {
+          value = optimizeZeroDegUnit(name, value);
+          value = optimizeUnits(name, value, options.unitsRegexp);
+        }
+
+        if (options.compatibility.properties.colors) {
+          value = optimizeColors(name, value, options.compatibility);
+        }
+      }
+
+      value = transformValue(name, value, levelOptions.transform);
+
+      if (value === IgnoreProperty) {
+        property.unused = true;
+        continue propertyLoop;
+      }
+
+      property.value[j][1] = value;
+    }
+
+    if (levelOptions.replaceMultipleZeros) {
+      optimizeMultipleZeros(property);
+    }
+
+    if (name == 'background' && levelOptions.optimizeBackground) {
+      optimizeBackground(property);
+    } else if (name.indexOf('border') === 0 && name.indexOf('radius') > 0 && levelOptions.optimizeBorderRadius) {
+      optimizeBorderRadius(property);
+    } else if (name == 'filter'&& levelOptions.optimizeFilter && options.compatibility.properties.ieFilters) {
+      optimizeFilter(property);
+    } else if (name == 'font' && levelOptions.optimizeFont) {
+      optimizeFont(property, options);
+    } else if (name == 'font-weight' && levelOptions.optimizeFontWeight) {
+      optimizeFontWeight(property, 0);
+    } else if (name == 'outline' && levelOptions.optimizeOutline) {
+      optimizeOutline(property);
+    }
+  }
+
+  restoreFromOptimizing(_properties);
+  removeUnused(_properties);
+
+  if (_properties.length != properties.length) {
+    removeComments(properties, options);
+  }
+}
+
+function removeComments(tokens, options) {
+  var token;
+  var i;
+
+  for (i = 0; i < tokens.length; i++) {
+    token = tokens[i];
+
+    if (token[0] != Token.COMMENT) {
+      continue;
+    }
+
+    optimizeComment(token, options);
+
+    if (token[1].length === 0) {
+      tokens.splice(i, 1);
+      i--;
+    }
+  }
+}
+
+function optimizeComment(token, options) {
+  if (token[1][2] == Marker.EXCLAMATION && (options.level[OptimizationLevel.One].specialComments == 'all' || options.commentsKept < options.level[OptimizationLevel.One].specialComments)) {
+    options.commentsKept++;
+    return;
+  }
+
+  token[1] = [];
+}
+
+function cleanupCharsets(tokens) {
+  var hasCharset = false;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    if (token[0] != Token.AT_RULE)
+      continue;
+
+    if (!CHARSET_REGEXP.test(token[1]))
+      continue;
+
+    if (hasCharset || token[1].indexOf(CHARSET_TOKEN) == -1) {
+      tokens.splice(i, 1);
+      i--;
+      l--;
+    } else {
+      hasCharset = true;
+      tokens.splice(i, 1);
+      tokens.unshift([Token.AT_RULE, token[1].replace(CHARSET_REGEXP, CHARSET_TOKEN)]);
+    }
+  }
+}
+
+function buildUnitRegexp(options) {
+  var units = ['px', 'em', 'ex', 'cm', 'mm', 'in', 'pt', 'pc', '%'];
+  var otherUnits = ['ch', 'rem', 'vh', 'vm', 'vmax', 'vmin', 'vw'];
+
+  otherUnits.forEach(function (unit) {
+    if (options.compatibility.units[unit]) {
+      units.push(unit);
+    }
+  });
+
+  return new RegExp('(^|\\s|\\(|,)0(?:' + units.join('|') + ')(\\W|$)', 'g');
+}
+
+function buildPrecisionOptions(roundingPrecision) {
+  var precisionOptions = {
+    matcher: null,
+    units: {},
+  };
+  var optimizable = [];
+  var unit;
+  var value;
+
+  for (unit in roundingPrecision) {
+    value = roundingPrecision[unit];
+
+    if (value != DEFAULT_ROUNDING_PRECISION) {
+      precisionOptions.units[unit] = {};
+      precisionOptions.units[unit].value = value;
+      precisionOptions.units[unit].multiplier = Math.pow(10, value);
+
+      optimizable.push(unit);
+    }
+  }
+
+  if (optimizable.length > 0) {
+    precisionOptions.enabled = true;
+    precisionOptions.decimalPointMatcher = new RegExp('(\\d)\\.($|' + optimizable.join('|') + ')($|\W)', 'g');
+    precisionOptions.zeroMatcher = new RegExp('(\\d*)(\\.\\d+)(' + optimizable.join('|') + ')', 'g');
+  }
+
+  return precisionOptions;
+}
+
+function isImport(token) {
+  return IMPORT_PREFIX_PATTERN.test(token[1]);
+}
+
+function isLegacyFilter(property) {
+  var value;
+
+  if (property.name == 'filter' || property.name == '-ms-filter') {
+    value = property.value[0][1];
+
+    return value.indexOf('progid') > -1 ||
+      value.indexOf('alpha') === 0 ||
+      value.indexOf('chroma') === 0;
+  } else {
+    return false;
+  }
+}
+
+function level1Optimize(tokens, context) {
+  var options = context.options;
+  var levelOptions = options.level[OptimizationLevel.One];
+  var ie7Hack = options.compatibility.selectors.ie7Hack;
+  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
+  var spaceAfterClosingBrace = options.compatibility.properties.spaceAfterClosingBrace;
+  var format = options.format;
+  var mayHaveCharset = false;
+  var afterRules = false;
+
+  options.unitsRegexp = options.unitsRegexp || buildUnitRegexp(options);
+  options.precision = options.precision || buildPrecisionOptions(levelOptions.roundingPrecision);
+  options.commentsKept = options.commentsKept || 0;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    switch (token[0]) {
+      case Token.AT_RULE:
+        token[1] = isImport(token) && afterRules ? '' : token[1];
+        token[1] = levelOptions.tidyAtRules ? tidyAtRule(token[1]) : token[1];
+        mayHaveCharset = true;
+        break;
+      case Token.AT_RULE_BLOCK:
+        optimizeBody(token[2], context);
+        afterRules = true;
+        break;
+      case Token.NESTED_BLOCK:
+        token[1] = levelOptions.tidyBlockScopes ? tidyBlock(token[1], spaceAfterClosingBrace) : token[1];
+        level1Optimize(token[2], context);
+        afterRules = true;
+        break;
+      case Token.COMMENT:
+        optimizeComment(token, options);
+        break;
+      case Token.RULE:
+        token[1] = levelOptions.tidySelectors ? tidyRules(token[1], !ie7Hack, adjacentSpace, format, context.warnings) : token[1];
+        token[1] = token[1].length > 1 ? sortSelectors(token[1], levelOptions.selectorsSortingMethod) : token[1];
+        optimizeBody(token[2], context);
+        afterRules = true;
+        break;
+    }
+
+    if (token[1].length === 0 || (token[2] && token[2].length === 0)) {
+      tokens.splice(i, 1);
+      i--;
+      l--;
+    }
+  }
+
+  if (levelOptions.cleanupCharsets && mayHaveCharset) {
+    cleanupCharsets(tokens);
+  }
+
+  return tokens;
+}
+
+module.exports = level1Optimize;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/shorten-hex.js b/node_modules/clean-css/lib/optimizer/level-1/shorten-hex.js
new file mode 100644
index 000000000..3deea381c
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/shorten-hex.js
@@ -0,0 +1,189 @@
+var COLORS = {
+  aliceblue: '#f0f8ff',
+  antiquewhite: '#faebd7',
+  aqua: '#0ff',
+  aquamarine: '#7fffd4',
+  azure: '#f0ffff',
+  beige: '#f5f5dc',
+  bisque: '#ffe4c4',
+  black: '#000',
+  blanchedalmond: '#ffebcd',
+  blue: '#00f',
+  blueviolet: '#8a2be2',
+  brown: '#a52a2a',
+  burlywood: '#deb887',
+  cadetblue: '#5f9ea0',
+  chartreuse: '#7fff00',
+  chocolate: '#d2691e',
+  coral: '#ff7f50',
+  cornflowerblue: '#6495ed',
+  cornsilk: '#fff8dc',
+  crimson: '#dc143c',
+  cyan: '#0ff',
+  darkblue: '#00008b',
+  darkcyan: '#008b8b',
+  darkgoldenrod: '#b8860b',
+  darkgray: '#a9a9a9',
+  darkgreen: '#006400',
+  darkgrey: '#a9a9a9',
+  darkkhaki: '#bdb76b',
+  darkmagenta: '#8b008b',
+  darkolivegreen: '#556b2f',
+  darkorange: '#ff8c00',
+  darkorchid: '#9932cc',
+  darkred: '#8b0000',
+  darksalmon: '#e9967a',
+  darkseagreen: '#8fbc8f',
+  darkslateblue: '#483d8b',
+  darkslategray: '#2f4f4f',
+  darkslategrey: '#2f4f4f',
+  darkturquoise: '#00ced1',
+  darkviolet: '#9400d3',
+  deeppink: '#ff1493',
+  deepskyblue: '#00bfff',
+  dimgray: '#696969',
+  dimgrey: '#696969',
+  dodgerblue: '#1e90ff',
+  firebrick: '#b22222',
+  floralwhite: '#fffaf0',
+  forestgreen: '#228b22',
+  fuchsia: '#f0f',
+  gainsboro: '#dcdcdc',
+  ghostwhite: '#f8f8ff',
+  gold: '#ffd700',
+  goldenrod: '#daa520',
+  gray: '#808080',
+  green: '#008000',
+  greenyellow: '#adff2f',
+  grey: '#808080',
+  honeydew: '#f0fff0',
+  hotpink: '#ff69b4',
+  indianred: '#cd5c5c',
+  indigo: '#4b0082',
+  ivory: '#fffff0',
+  khaki: '#f0e68c',
+  lavender: '#e6e6fa',
+  lavenderblush: '#fff0f5',
+  lawngreen: '#7cfc00',
+  lemonchiffon: '#fffacd',
+  lightblue: '#add8e6',
+  lightcoral: '#f08080',
+  lightcyan: '#e0ffff',
+  lightgoldenrodyellow: '#fafad2',
+  lightgray: '#d3d3d3',
+  lightgreen: '#90ee90',
+  lightgrey: '#d3d3d3',
+  lightpink: '#ffb6c1',
+  lightsalmon: '#ffa07a',
+  lightseagreen: '#20b2aa',
+  lightskyblue: '#87cefa',
+  lightslategray: '#778899',
+  lightslategrey: '#778899',
+  lightsteelblue: '#b0c4de',
+  lightyellow: '#ffffe0',
+  lime: '#0f0',
+  limegreen: '#32cd32',
+  linen: '#faf0e6',
+  magenta: '#ff00ff',
+  maroon: '#800000',
+  mediumaquamarine: '#66cdaa',
+  mediumblue: '#0000cd',
+  mediumorchid: '#ba55d3',
+  mediumpurple: '#9370db',
+  mediumseagreen: '#3cb371',
+  mediumslateblue: '#7b68ee',
+  mediumspringgreen: '#00fa9a',
+  mediumturquoise: '#48d1cc',
+  mediumvioletred: '#c71585',
+  midnightblue: '#191970',
+  mintcream: '#f5fffa',
+  mistyrose: '#ffe4e1',
+  moccasin: '#ffe4b5',
+  navajowhite: '#ffdead',
+  navy: '#000080',
+  oldlace: '#fdf5e6',
+  olive: '#808000',
+  olivedrab: '#6b8e23',
+  orange: '#ffa500',
+  orangered: '#ff4500',
+  orchid: '#da70d6',
+  palegoldenrod: '#eee8aa',
+  palegreen: '#98fb98',
+  paleturquoise: '#afeeee',
+  palevioletred: '#db7093',
+  papayawhip: '#ffefd5',
+  peachpuff: '#ffdab9',
+  peru: '#cd853f',
+  pink: '#ffc0cb',
+  plum: '#dda0dd',
+  powderblue: '#b0e0e6',
+  purple: '#800080',
+  rebeccapurple: '#663399',
+  red: '#f00',
+  rosybrown: '#bc8f8f',
+  royalblue: '#4169e1',
+  saddlebrown: '#8b4513',
+  salmon: '#fa8072',
+  sandybrown: '#f4a460',
+  seagreen: '#2e8b57',
+  seashell: '#fff5ee',
+  sienna: '#a0522d',
+  silver: '#c0c0c0',
+  skyblue: '#87ceeb',
+  slateblue: '#6a5acd',
+  slategray: '#708090',
+  slategrey: '#708090',
+  snow: '#fffafa',
+  springgreen: '#00ff7f',
+  steelblue: '#4682b4',
+  tan: '#d2b48c',
+  teal: '#008080',
+  thistle: '#d8bfd8',
+  tomato: '#ff6347',
+  turquoise: '#40e0d0',
+  violet: '#ee82ee',
+  wheat: '#f5deb3',
+  white: '#fff',
+  whitesmoke: '#f5f5f5',
+  yellow: '#ff0',
+  yellowgreen: '#9acd32'
+};
+
+var toHex = {};
+var toName = {};
+
+for (var name in COLORS) {
+  var hex = COLORS[name];
+
+  if (name.length < hex.length) {
+    toName[hex] = name;
+  } else {
+    toHex[name] = hex;
+  }
+}
+
+var toHexPattern = new RegExp('(^| |,|\\))(' + Object.keys(toHex).join('|') + ')( |,|\\)|$)', 'ig');
+var toNamePattern = new RegExp('(' + Object.keys(toName).join('|') + ')([^a-f0-9]|$)', 'ig');
+
+function hexConverter(match, prefix, colorValue, suffix) {
+  return prefix + toHex[colorValue.toLowerCase()] + suffix;
+}
+
+function nameConverter(match, colorValue, suffix) {
+  return toName[colorValue.toLowerCase()] + suffix;
+}
+
+function shortenHex(value) {
+  var hasHex = value.indexOf('#') > -1;
+  var shortened = value.replace(toHexPattern, hexConverter);
+
+  if (shortened != value) {
+    shortened = shortened.replace(toHexPattern, hexConverter);
+  }
+
+  return hasHex ?
+    shortened.replace(toNamePattern, nameConverter) :
+    shortened;
+}
+
+module.exports = shortenHex;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/shorten-hsl.js b/node_modules/clean-css/lib/optimizer/level-1/shorten-hsl.js
new file mode 100644
index 000000000..fe98dfd39
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/shorten-hsl.js
@@ -0,0 +1,61 @@
+// HSL to RGB converter. Both methods adapted from:
+// http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
+
+function hslToRgb(h, s, l) {
+  var r, g, b;
+
+  // normalize hue orientation b/w 0 and 360 degrees
+  h = h % 360;
+  if (h < 0)
+    h += 360;
+  h = ~~h / 360;
+
+  if (s < 0)
+    s = 0;
+  else if (s > 100)
+    s = 100;
+  s = ~~s / 100;
+
+  if (l < 0)
+    l = 0;
+  else if (l > 100)
+    l = 100;
+  l = ~~l / 100;
+
+  if (s === 0) {
+    r = g = b = l; // achromatic
+  } else {
+    var q = l < 0.5 ?
+      l * (1 + s) :
+      l + s - l * s;
+    var p = 2 * l - q;
+    r = hueToRgb(p, q, h + 1/3);
+    g = hueToRgb(p, q, h);
+    b = hueToRgb(p, q, h - 1/3);
+  }
+
+  return [~~(r * 255), ~~(g * 255), ~~(b * 255)];
+}
+
+function hueToRgb(p, q, t) {
+  if (t < 0) t += 1;
+  if (t > 1) t -= 1;
+  if (t < 1/6) return p + (q - p) * 6 * t;
+  if (t < 1/2) return q;
+  if (t < 2/3) return p + (q - p) * (2/3 - t) * 6;
+  return p;
+}
+
+function shortenHsl(hue, saturation, lightness) {
+  var asRgb = hslToRgb(hue, saturation, lightness);
+  var redAsHex = asRgb[0].toString(16);
+  var greenAsHex = asRgb[1].toString(16);
+  var blueAsHex = asRgb[2].toString(16);
+
+  return '#' +
+    ((redAsHex.length == 1 ? '0' : '') + redAsHex) +
+    ((greenAsHex.length == 1 ? '0' : '') + greenAsHex) +
+    ((blueAsHex.length == 1 ? '0' : '') + blueAsHex);
+}
+
+module.exports = shortenHsl;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/shorten-rgb.js b/node_modules/clean-css/lib/optimizer/level-1/shorten-rgb.js
new file mode 100644
index 000000000..3c0a5fa31
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/shorten-rgb.js
@@ -0,0 +1,10 @@
+function shortenRgb(red, green, blue) {
+  var normalizedRed = Math.max(0, Math.min(parseInt(red), 255));
+  var normalizedGreen = Math.max(0, Math.min(parseInt(green), 255));
+  var normalizedBlue = Math.max(0, Math.min(parseInt(blue), 255));
+
+  // Credit: Asen  http://jsbin.com/UPUmaGOc/2/edit?js,console
+  return '#' + ('00000' + (normalizedRed << 16 | normalizedGreen << 8 | normalizedBlue).toString(16)).slice(-6);
+}
+
+module.exports = shortenRgb;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/sort-selectors.js b/node_modules/clean-css/lib/optimizer/level-1/sort-selectors.js
new file mode 100644
index 000000000..2f179e6ef
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/sort-selectors.js
@@ -0,0 +1,25 @@
+var naturalCompare = require('../../utils/natural-compare');
+
+function naturalSorter(scope1, scope2) {
+  return naturalCompare(scope1[1], scope2[1]);
+}
+
+function standardSorter(scope1, scope2) {
+  return scope1[1] > scope2[1] ? 1 : -1;
+}
+
+function sortSelectors(selectors, method) {
+  var sorter;
+
+  switch (method) {
+    case 'natural':
+      sorter = naturalSorter;
+      break;
+    case 'standard':
+      sorter = standardSorter;
+  }
+
+  return selectors.sort(sorter);
+}
+
+module.exports = sortSelectors;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/tidy-at-rule.js b/node_modules/clean-css/lib/optimizer/level-1/tidy-at-rule.js
new file mode 100644
index 000000000..a7b149fb5
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/tidy-at-rule.js
@@ -0,0 +1,9 @@
+function tidyAtRule(value) {
+  return value
+    .replace(/\s+/g, ' ')
+    .replace(/url\(\s+/g, 'url(')
+    .replace(/\s+\)/g, ')')
+    .trim();
+}
+
+module.exports = tidyAtRule;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/tidy-block.js b/node_modules/clean-css/lib/optimizer/level-1/tidy-block.js
new file mode 100644
index 000000000..8322aeca7
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/tidy-block.js
@@ -0,0 +1,23 @@
+var SUPPORTED_COMPACT_BLOCK_MATCHER = /^@media\W/;
+
+function tidyBlock(values, spaceAfterClosingBrace) {
+  var withoutSpaceAfterClosingBrace;
+  var i;
+
+  for (i = values.length - 1; i >= 0; i--) {
+    withoutSpaceAfterClosingBrace = !spaceAfterClosingBrace && SUPPORTED_COMPACT_BLOCK_MATCHER.test(values[i][1]);
+
+    values[i][1] = values[i][1]
+      .replace(/\n|\r\n/g, ' ')
+      .replace(/\s+/g, ' ')
+      .replace(/(,|:|\() /g, '$1')
+      .replace(/ \)/g, ')')
+      .replace(/'([a-zA-Z][a-zA-Z\d\-_]+)'/, '$1')
+      .replace(/"([a-zA-Z][a-zA-Z\d\-_]+)"/, '$1')
+      .replace(withoutSpaceAfterClosingBrace ? /\) /g : null, ')');
+  }
+
+  return values;
+}
+
+module.exports = tidyBlock;
diff --git a/node_modules/clean-css/lib/optimizer/level-1/tidy-rules.js b/node_modules/clean-css/lib/optimizer/level-1/tidy-rules.js
new file mode 100644
index 000000000..b47ed6b79
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-1/tidy-rules.js
@@ -0,0 +1,213 @@
+var Spaces = require('../../options/format').Spaces;
+var Marker = require('../../tokenizer/marker');
+var formatPosition = require('../../utils/format-position');
+
+var CASE_ATTRIBUTE_PATTERN = /[\s"'][iI]\s*\]/;
+var CASE_RESTORE_PATTERN = /([\d\w])([iI])\]/g;
+var DOUBLE_QUOTE_CASE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"([iI])/g;
+var DOUBLE_QUOTE_PATTERN = /="([a-zA-Z][a-zA-Z\d\-_]+)"(\s|\])/g;
+var HTML_COMMENT_PATTERN = /^(?:(?:<!--|-->)\s*)+/;
+var SINGLE_QUOTE_CASE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'([iI])/g;
+var SINGLE_QUOTE_PATTERN = /='([a-zA-Z][a-zA-Z\d\-_]+)'(\s|\])/g;
+var RELATION_PATTERN = /[>\+~]/;
+var WHITESPACE_PATTERN = /\s/;
+
+var ASTERISK_PLUS_HTML_HACK = '*+html ';
+var ASTERISK_FIRST_CHILD_PLUS_HTML_HACK = '*:first-child+html ';
+var LESS_THAN = '<';
+
+function hasInvalidCharacters(value) {
+  var isEscaped;
+  var isInvalid = false;
+  var character;
+  var isQuote = false;
+  var i, l;
+
+  for (i = 0, l = value.length; i < l; i++) {
+    character = value[i];
+
+    if (isEscaped) {
+      // continue as always
+    } else if (character == Marker.SINGLE_QUOTE || character == Marker.DOUBLE_QUOTE) {
+      isQuote = !isQuote;
+    } else if (!isQuote && (character == Marker.CLOSE_CURLY_BRACKET || character == Marker.EXCLAMATION || character == LESS_THAN || character == Marker.SEMICOLON)) {
+      isInvalid = true;
+      break;
+    } else if (!isQuote && i === 0 && RELATION_PATTERN.test(character)) {
+      isInvalid = true;
+      break;
+    }
+
+    isEscaped = character == Marker.BACK_SLASH;
+  }
+
+  return isInvalid;
+}
+
+function removeWhitespace(value, format) {
+  var stripped = [];
+  var character;
+  var isNewLineNix;
+  var isNewLineWin;
+  var isEscaped;
+  var wasEscaped;
+  var isQuoted;
+  var isSingleQuoted;
+  var isDoubleQuoted;
+  var isAttribute;
+  var isRelation;
+  var isWhitespace;
+  var roundBracketLevel = 0;
+  var wasRelation = false;
+  var wasWhitespace = false;
+  var withCaseAttribute = CASE_ATTRIBUTE_PATTERN.test(value);
+  var spaceAroundRelation = format && format.spaces[Spaces.AroundSelectorRelation];
+  var i, l;
+
+  for (i = 0, l = value.length; i < l; i++) {
+    character = value[i];
+
+    isNewLineNix = character == Marker.NEW_LINE_NIX;
+    isNewLineWin = character == Marker.NEW_LINE_NIX && value[i - 1] == Marker.NEW_LINE_WIN;
+    isQuoted = isSingleQuoted || isDoubleQuoted;
+    isRelation = !isEscaped && roundBracketLevel === 0 && RELATION_PATTERN.test(character);
+    isWhitespace = WHITESPACE_PATTERN.test(character);
+
+    if (wasEscaped && isQuoted && isNewLineWin) {
+      // swallow escaped new windows lines in comments
+      stripped.pop();
+      stripped.pop();
+    } else if (isEscaped && isQuoted && isNewLineNix) {
+      // swallow escaped new *nix lines in comments
+      stripped.pop();
+    } else if (isEscaped) {
+      stripped.push(character);
+    } else if (character == Marker.OPEN_SQUARE_BRACKET && !isQuoted) {
+      stripped.push(character);
+      isAttribute = true;
+    } else if (character == Marker.CLOSE_SQUARE_BRACKET && !isQuoted) {
+      stripped.push(character);
+      isAttribute = false;
+    } else if (character == Marker.OPEN_ROUND_BRACKET && !isQuoted) {
+      stripped.push(character);
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && !isQuoted) {
+      stripped.push(character);
+      roundBracketLevel--;
+    } else if (character == Marker.SINGLE_QUOTE && !isQuoted) {
+      stripped.push(character);
+      isSingleQuoted = true;
+    } else if (character == Marker.DOUBLE_QUOTE && !isQuoted) {
+      stripped.push(character);
+      isDoubleQuoted = true;
+    } else if (character == Marker.SINGLE_QUOTE && isQuoted) {
+      stripped.push(character);
+      isSingleQuoted = false;
+    } else if (character == Marker.DOUBLE_QUOTE && isQuoted) {
+      stripped.push(character);
+      isDoubleQuoted = false;
+    } else if (isWhitespace && wasRelation && !spaceAroundRelation) {
+      continue;
+    } else if (!isWhitespace && wasRelation && spaceAroundRelation) {
+      stripped.push(Marker.SPACE);
+      stripped.push(character);
+    } else if (isWhitespace && (isAttribute || roundBracketLevel > 0) && !isQuoted) {
+      // skip space
+    } else if (isWhitespace && wasWhitespace && !isQuoted) {
+      // skip extra space
+    } else if ((isNewLineWin || isNewLineNix) && (isAttribute || roundBracketLevel > 0) && isQuoted) {
+      // skip newline
+    } else if (isRelation && wasWhitespace && !spaceAroundRelation) {
+      stripped.pop();
+      stripped.push(character);
+    } else if (isRelation && !wasWhitespace && spaceAroundRelation) {
+      stripped.push(Marker.SPACE);
+      stripped.push(character);
+    } else if (isWhitespace) {
+      stripped.push(Marker.SPACE);
+    } else {
+      stripped.push(character);
+    }
+
+    wasEscaped = isEscaped;
+    isEscaped = character == Marker.BACK_SLASH;
+    wasRelation = isRelation;
+    wasWhitespace = isWhitespace;
+  }
+
+  return withCaseAttribute ?
+    stripped.join('').replace(CASE_RESTORE_PATTERN, '$1 $2]') :
+    stripped.join('');
+}
+
+function removeQuotes(value) {
+  if (value.indexOf('\'') == -1 && value.indexOf('"') == -1) {
+    return value;
+  }
+
+  return value
+    .replace(SINGLE_QUOTE_CASE_PATTERN, '=$1 $2')
+    .replace(SINGLE_QUOTE_PATTERN, '=$1$2')
+    .replace(DOUBLE_QUOTE_CASE_PATTERN, '=$1 $2')
+    .replace(DOUBLE_QUOTE_PATTERN, '=$1$2');
+}
+
+function tidyRules(rules, removeUnsupported, adjacentSpace, format, warnings) {
+  var list = [];
+  var repeated = [];
+
+  function removeHTMLComment(rule, match) {
+    warnings.push('HTML comment \'' + match + '\' at ' + formatPosition(rule[2][0]) + '. Removing.');
+    return '';
+  }
+
+  for (var i = 0, l = rules.length; i < l; i++) {
+    var rule = rules[i];
+    var reduced = rule[1];
+
+    reduced = reduced.replace(HTML_COMMENT_PATTERN, removeHTMLComment.bind(null, rule));
+
+    if (hasInvalidCharacters(reduced)) {
+      warnings.push('Invalid selector \'' + rule[1] + '\' at ' + formatPosition(rule[2][0]) + '. Ignoring.');
+      continue;
+    }
+
+    reduced = removeWhitespace(reduced, format);
+    reduced = removeQuotes(reduced);
+
+    if (adjacentSpace && reduced.indexOf('nav') > 0) {
+      reduced = reduced.replace(/\+nav(\S|$)/, '+ nav$1');
+    }
+
+    if (removeUnsupported && reduced.indexOf(ASTERISK_PLUS_HTML_HACK) > -1) {
+      continue;
+    }
+
+    if (removeUnsupported && reduced.indexOf(ASTERISK_FIRST_CHILD_PLUS_HTML_HACK) > -1) {
+      continue;
+    }
+
+    if (reduced.indexOf('*') > -1) {
+      reduced = reduced
+        .replace(/\*([:#\.\[])/g, '$1')
+        .replace(/^(\:first\-child)?\+html/, '*$1+html');
+    }
+
+    if (repeated.indexOf(reduced) > -1) {
+      continue;
+    }
+
+    rule[1] = reduced;
+    repeated.push(reduced);
+    list.push(rule);
+  }
+
+  if (list.length == 1 && list[0][1].length === 0) {
+    warnings.push('Empty selector \'' + list[0][1] + '\' at ' + formatPosition(list[0][2][0]) + '. Ignoring.');
+    list = [];
+  }
+
+  return list;
+}
+
+module.exports = tidyRules;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/break-up.js b/node_modules/clean-css/lib/optimizer/level-2/break-up.js
new file mode 100644
index 000000000..9e44d5a1f
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/break-up.js
@@ -0,0 +1,362 @@
+var InvalidPropertyError = require('./invalid-property-error');
+
+var wrapSingle = require('../wrap-for-optimizing').single;
+
+var Token = require('../../tokenizer/token');
+
+var formatPosition = require('../../utils/format-position');
+
+var MULTIPLEX_SEPARATOR = ',';
+
+function _colorFilter(validator) {
+  return function (value) {
+    return value[1] == 'invert' || validator.isValidColor(value[1]) || validator.isValidVendorPrefixedValue(value[1]);
+  };
+}
+
+function _styleFilter(validator) {
+  return function (value) {
+    return value[1] != 'inherit' && validator.isValidStyle(value[1]) && !validator.isValidColorValue(value[1]);
+  };
+}
+
+function _wrapDefault(name, property, compactable) {
+  var descriptor = compactable[name];
+  if (descriptor.doubleValues && descriptor.defaultValue.length == 2) {
+    return wrapSingle([
+      Token.PROPERTY,
+      [Token.PROPERTY_NAME, name],
+      [Token.PROPERTY_VALUE, descriptor.defaultValue[0]],
+      [Token.PROPERTY_VALUE, descriptor.defaultValue[1]]
+    ]);
+  } else if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
+    return wrapSingle([
+      Token.PROPERTY,
+      [Token.PROPERTY_NAME, name],
+      [Token.PROPERTY_VALUE, descriptor.defaultValue[0]]
+    ]);
+  } else {
+    return wrapSingle([
+      Token.PROPERTY,
+      [Token.PROPERTY_NAME, name],
+      [Token.PROPERTY_VALUE, descriptor.defaultValue]
+    ]);
+  }
+}
+
+function _widthFilter(validator) {
+  return function (value) {
+    return value[1] != 'inherit' && validator.isValidWidth(value[1]) && !validator.isValidStyle(value[1]) && !validator.isValidColorValue(value[1]);
+  };
+}
+
+function background(property, compactable, validator) {
+  var image = _wrapDefault('background-image', property, compactable);
+  var position = _wrapDefault('background-position', property, compactable);
+  var size = _wrapDefault('background-size', property, compactable);
+  var repeat = _wrapDefault('background-repeat', property, compactable);
+  var attachment = _wrapDefault('background-attachment', property, compactable);
+  var origin = _wrapDefault('background-origin', property, compactable);
+  var clip = _wrapDefault('background-clip', property, compactable);
+  var color = _wrapDefault('background-color', property, compactable);
+  var components = [image, position, size, repeat, attachment, origin, clip, color];
+  var values = property.value;
+
+  var positionSet = false;
+  var clipSet = false;
+  var originSet = false;
+  var repeatSet = false;
+
+  var anyValueSet = false;
+
+  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
+    // NOTE: 'inherit' is not a valid value for background-attachment
+    color.value = image.value =  repeat.value = position.value = size.value = origin.value = clip.value = property.value;
+    return components;
+  }
+
+  if (property.value.length == 1 && property.value[0][1] == '0 0') {
+    return components;
+  }
+
+  for (var i = values.length - 1; i >= 0; i--) {
+    var value = values[i];
+
+    if (validator.isValidBackgroundAttachment(value[1])) {
+      attachment.value = [value];
+      anyValueSet = true;
+    } else if (validator.isValidBackgroundClip(value[1]) || validator.isValidBackgroundOrigin(value[1])) {
+      if (clipSet) {
+        origin.value = [value];
+        originSet = true;
+      } else {
+        clip.value = [value];
+        clipSet = true;
+      }
+      anyValueSet = true;
+    } else if (validator.isValidBackgroundRepeat(value[1])) {
+      if (repeatSet) {
+        repeat.value.unshift(value);
+      } else {
+        repeat.value = [value];
+        repeatSet = true;
+      }
+      anyValueSet = true;
+    } else if (validator.isValidBackgroundPositionPart(value[1]) || validator.isValidBackgroundSizePart(value[1])) {
+      if (i > 0) {
+        var previousValue = values[i - 1];
+
+        if (previousValue[1] == '/') {
+          size.value = [value];
+        } else if (i > 1 && values[i - 2][1] == '/') {
+          size.value = [previousValue, value];
+          i -= 2;
+        } else {
+          if (!positionSet)
+            position.value = [];
+
+          position.value.unshift(value);
+          positionSet = true;
+        }
+      } else {
+        if (!positionSet)
+          position.value = [];
+
+        position.value.unshift(value);
+        positionSet = true;
+      }
+      anyValueSet = true;
+    } else if ((color.value[0][1] == compactable[color.name].defaultValue || color.value[0][1] == 'none') && (validator.isValidColor(value[1]) || validator.isValidVendorPrefixedValue(value[1]))) {
+      color.value = [value];
+      anyValueSet = true;
+    } else if (validator.isValidUrl(value[1]) || validator.isValidFunction(value[1])) {
+      image.value = [value];
+      anyValueSet = true;
+    }
+  }
+
+  if (clipSet && !originSet)
+    origin.value = clip.value.slice(0);
+
+  if (!anyValueSet) {
+    throw new InvalidPropertyError('Invalid background value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  return components;
+}
+
+function borderRadius(property, compactable) {
+  var values = property.value;
+  var splitAt = -1;
+
+  for (var i = 0, l = values.length; i < l; i++) {
+    if (values[i][1] == '/') {
+      splitAt = i;
+      break;
+    }
+  }
+
+  if (splitAt === 0 || splitAt === values.length - 1) {
+    throw new InvalidPropertyError('Invalid border-radius value at ' + formatPosition(values[0][2][0]) + '. Ignoring.');
+  }
+
+  var target = _wrapDefault(property.name, property, compactable);
+  target.value = splitAt > -1 ?
+    values.slice(0, splitAt) :
+    values.slice(0);
+  target.components = fourValues(target, compactable);
+
+  var remainder = _wrapDefault(property.name, property, compactable);
+  remainder.value = splitAt > -1 ?
+    values.slice(splitAt + 1) :
+    values.slice(0);
+  remainder.components = fourValues(remainder, compactable);
+
+  for (var j = 0; j < 4; j++) {
+    target.components[j].multiplex = true;
+    target.components[j].value = target.components[j].value.concat(remainder.components[j].value);
+  }
+
+  return target.components;
+}
+
+function fourValues(property, compactable) {
+  var componentNames = compactable[property.name].components;
+  var components = [];
+  var value = property.value;
+
+  if (value.length < 1)
+    return [];
+
+  if (value.length < 2)
+    value[1] = value[0].slice(0);
+  if (value.length < 3)
+    value[2] = value[0].slice(0);
+  if (value.length < 4)
+    value[3] = value[1].slice(0);
+
+  for (var i = componentNames.length - 1; i >= 0; i--) {
+    var component = wrapSingle([
+      Token.PROPERTY,
+      [Token.PROPERTY_NAME, componentNames[i]]
+    ]);
+    component.value = [value[i]];
+    components.unshift(component);
+  }
+
+  return components;
+}
+
+function multiplex(splitWith) {
+  return function (property, compactable, validator) {
+    var splitsAt = [];
+    var values = property.value;
+    var i, j, l, m;
+
+    // find split commas
+    for (i = 0, l = values.length; i < l; i++) {
+      if (values[i][1] == ',')
+        splitsAt.push(i);
+    }
+
+    if (splitsAt.length === 0)
+      return splitWith(property, compactable, validator);
+
+    var splitComponents = [];
+
+    // split over commas, and into components
+    for (i = 0, l = splitsAt.length; i <= l; i++) {
+      var from = i === 0 ? 0 : splitsAt[i - 1] + 1;
+      var to = i < l ? splitsAt[i] : values.length;
+
+      var _property = _wrapDefault(property.name, property, compactable);
+      _property.value = values.slice(from, to);
+
+      splitComponents.push(splitWith(_property, compactable, validator));
+    }
+
+    var components = splitComponents[0];
+
+    // group component values from each split
+    for (i = 0, l = components.length; i < l; i++) {
+      components[i].multiplex = true;
+
+      for (j = 1, m = splitComponents.length; j < m; j++) {
+        components[i].value.push([Token.PROPERTY_VALUE, MULTIPLEX_SEPARATOR]);
+        Array.prototype.push.apply(components[i].value, splitComponents[j][i].value);
+      }
+    }
+
+    return components;
+  };
+}
+
+function listStyle(property, compactable, validator) {
+  var type = _wrapDefault('list-style-type', property, compactable);
+  var position = _wrapDefault('list-style-position', property, compactable);
+  var image = _wrapDefault('list-style-image', property, compactable);
+  var components = [type, position, image];
+
+  if (property.value.length == 1 && property.value[0][1] == 'inherit') {
+    type.value = position.value = image.value = [property.value[0]];
+    return components;
+  }
+
+  var values = property.value.slice(0);
+  var total = values.length;
+  var index = 0;
+
+  // `image` first...
+  for (index = 0, total = values.length; index < total; index++) {
+    if (validator.isValidUrl(values[index][1]) || values[index][1] == '0') {
+      image.value = [values[index]];
+      values.splice(index, 1);
+      break;
+    }
+  }
+
+  // ... then `type`...
+  for (index = 0, total = values.length; index < total; index++) {
+    if (validator.isValidListStyleType(values[index][1])) {
+      type.value = [values[index]];
+      values.splice(index, 1);
+      break;
+    }
+  }
+
+  // ... and what's left is a `position`
+  if (values.length > 0 && validator.isValidListStylePosition(values[0][1]))
+    position.value = [values[0]];
+
+  return components;
+}
+
+function widthStyleColor(property, compactable, validator) {
+  var descriptor = compactable[property.name];
+  var components = [
+    _wrapDefault(descriptor.components[0], property, compactable),
+    _wrapDefault(descriptor.components[1], property, compactable),
+    _wrapDefault(descriptor.components[2], property, compactable)
+  ];
+  var color, style, width;
+
+  for (var i = 0; i < 3; i++) {
+    var component = components[i];
+
+    if (component.name.indexOf('color') > 0)
+      color = component;
+    else if (component.name.indexOf('style') > 0)
+      style = component;
+    else
+      width = component;
+  }
+
+  if ((property.value.length == 1 && property.value[0][1] == 'inherit') ||
+      (property.value.length == 3 && property.value[0][1] == 'inherit' && property.value[1][1] == 'inherit' && property.value[2][1] == 'inherit')) {
+    color.value = style.value = width.value = [property.value[0]];
+    return components;
+  }
+
+  var values = property.value.slice(0);
+  var match, matches;
+
+  // NOTE: usually users don't follow the required order of parts in this shorthand,
+  // so we'll try to parse it caring as little about order as possible
+
+  if (values.length > 0) {
+    matches = values.filter(_widthFilter(validator));
+    match = matches.length > 1 && (matches[0][1] == 'none' || matches[0][1] == 'auto') ? matches[1] : matches[0];
+    if (match) {
+      width.value = [match];
+      values.splice(values.indexOf(match), 1);
+    }
+  }
+
+  if (values.length > 0) {
+    match = values.filter(_styleFilter(validator))[0];
+    if (match) {
+      style.value = [match];
+      values.splice(values.indexOf(match), 1);
+    }
+  }
+
+  if (values.length > 0) {
+    match = values.filter(_colorFilter(validator))[0];
+    if (match) {
+      color.value = [match];
+      values.splice(values.indexOf(match), 1);
+    }
+  }
+
+  return components;
+}
+
+module.exports = {
+  background: background,
+  border: widthStyleColor,
+  borderRadius: borderRadius,
+  fourValues: fourValues,
+  listStyle: listStyle,
+  multiplex: multiplex,
+  outline: widthStyleColor
+};
diff --git a/node_modules/clean-css/lib/optimizer/level-2/can-override.js b/node_modules/clean-css/lib/optimizer/level-2/can-override.js
new file mode 100644
index 000000000..2617234ca
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/can-override.js
@@ -0,0 +1,180 @@
+var understandable = require('./properties/understandable');
+
+function backgroundPosition(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isValidKeywordValue('background-position', value2, true)) {
+    return false;
+  } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+    return true;
+  } else if (validator.isValidKeywordValue('background-position', value2, true)) {
+    return true;
+  }
+
+  return unit(validator, value1, value2);
+}
+
+function backgroundSize(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isValidKeywordValue('background-size', value2, true)) {
+    return false;
+  } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+    return true;
+  } else if (validator.isValidKeywordValue('background-size', value2, true)) {
+    return true;
+  }
+
+  return unit(validator, value1, value2);
+}
+
+function color(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isValidColor(value2)) {
+    return false;
+  } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+    return true;
+  } else if (!validator.colorOpacity && (validator.isValidRgbaColor(value1) || validator.isValidHslaColor(value1))) {
+    return false;
+  } else if (!validator.colorOpacity && (validator.isValidRgbaColor(value2) || validator.isValidHslaColor(value2))) {
+    return false;
+  } else if (validator.isValidColor(value1) && validator.isValidColor(value2)) {
+    return true;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function components(overrideCheckers) {
+  return function (validator, value1, value2, position) {
+    return overrideCheckers[position](validator, value1, value2);
+  };
+}
+
+function image(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isValidImage(value2)) {
+    return false;
+  } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+    return true;
+  } else if (validator.isValidImage(value2)) {
+    return true;
+  } else if (validator.isValidImage(value1)) {
+    return false;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function keyword(propertyName) {
+  return function(validator, value1, value2) {
+    if (!understandable(validator, value1, value2, 0, true) && !validator.isValidKeywordValue(propertyName, value2)) {
+      return false;
+    } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+      return true;
+    }
+
+    return validator.isValidKeywordValue(propertyName, value2, false);
+  };
+}
+
+function keywordWithGlobal(propertyName) {
+  return function(validator, value1, value2) {
+    if (!understandable(validator, value1, value2, 0, true) && !validator.isValidKeywordValue(propertyName, value2, true)) {
+      return false;
+    } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+      return true;
+    }
+
+    return validator.isValidKeywordValue(propertyName, value2, true);
+  };
+}
+
+function sameFunctionOrValue(validator, value1, value2) {
+  return validator.areSameFunction(value1, value2) ?
+    true :
+    value1 === value2;
+}
+
+function textShadow(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isValidTextShadow(value2)) {
+    return false;
+  } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+    return true;
+  }
+
+  return validator.isValidTextShadow(value2);
+}
+
+function unit(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isValidUnitWithoutFunction(value2)) {
+    return false;
+  } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+    return true;
+  } else if (validator.isValidUnitWithoutFunction(value1) && !validator.isValidUnitWithoutFunction(value2)) {
+    return false;
+  } else if (validator.isValidUnitWithoutFunction(value2)) {
+    return true;
+  } else if (validator.isValidUnitWithoutFunction(value1)) {
+    return false;
+  } else if (validator.isValidFunctionWithoutVendorPrefix(value1) && validator.isValidFunctionWithoutVendorPrefix(value2)) {
+    return true;
+  }
+
+  return sameFunctionOrValue(validator, value1, value2);
+}
+
+function unitOrKeywordWithGlobal(propertyName) {
+  var byKeyword = keywordWithGlobal(propertyName);
+
+  return function(validator, value1, value2) {
+    return unit(validator, value1, value2) || byKeyword(validator, value1, value2);
+  };
+}
+
+function zIndex(validator, value1, value2) {
+  if (!understandable(validator, value1, value2, 0, true) && !validator.isValidZIndex(value2)) {
+    return false;
+  } else if (validator.isValidVariable(value1) && validator.isValidVariable(value2)) {
+    return true;
+  }
+
+  return validator.isValidZIndex(value2);
+}
+
+module.exports = {
+  generic: {
+    color: color,
+    components: components,
+    image: image,
+    unit: unit
+  },
+  property: {
+    backgroundAttachment: keyword('background-attachment'),
+    backgroundClip: keywordWithGlobal('background-clip'),
+    backgroundOrigin: keyword('background-origin'),
+    backgroundPosition: backgroundPosition,
+    backgroundRepeat: keyword('background-repeat'),
+    backgroundSize: backgroundSize,
+    bottom: unitOrKeywordWithGlobal('bottom'),
+    borderCollapse: keyword('border-collapse'),
+    borderStyle: keywordWithGlobal('*-style'),
+    clear: keywordWithGlobal('clear'),
+    cursor: keywordWithGlobal('cursor'),
+    display: keywordWithGlobal('display'),
+    float: keywordWithGlobal('float'),
+    fontStyle: keywordWithGlobal('font-style'),
+    left: unitOrKeywordWithGlobal('left'),
+    fontWeight: keywordWithGlobal('font-weight'),
+    listStyleType: keywordWithGlobal('list-style-type'),
+    listStylePosition: keywordWithGlobal('list-style-position'),
+    outlineStyle: keywordWithGlobal('*-style'),
+    overflow: keywordWithGlobal('overflow'),
+    position: keywordWithGlobal('position'),
+    right: unitOrKeywordWithGlobal('right'),
+    textAlign: keywordWithGlobal('text-align'),
+    textDecoration: keywordWithGlobal('text-decoration'),
+    textOverflow: keywordWithGlobal('text-overflow'),
+    textShadow: textShadow,
+    top: unitOrKeywordWithGlobal('top'),
+    transform: sameFunctionOrValue,
+    verticalAlign: unitOrKeywordWithGlobal('vertical-align'),
+    visibility: keywordWithGlobal('visibility'),
+    whiteSpace: keywordWithGlobal('white-space'),
+    zIndex: zIndex
+  }
+};
diff --git a/node_modules/clean-css/lib/optimizer/level-2/clone.js b/node_modules/clean-css/lib/optimizer/level-2/clone.js
new file mode 100644
index 000000000..3830095e9
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/clone.js
@@ -0,0 +1,33 @@
+var wrapSingle = require('../wrap-for-optimizing').single;
+
+var Token = require('../../tokenizer/token');
+
+function deep(property) {
+  var cloned = shallow(property);
+  for (var i = property.components.length - 1; i >= 0; i--) {
+    var component = shallow(property.components[i]);
+    component.value = property.components[i].value.slice(0);
+    cloned.components.unshift(component);
+  }
+
+  cloned.dirty = true;
+  cloned.value = property.value.slice(0);
+
+  return cloned;
+}
+
+function shallow(property) {
+  var cloned = wrapSingle([
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, property.name]
+  ]);
+  cloned.important = property.important;
+  cloned.hack = property.hack;
+  cloned.unused = false;
+  return cloned;
+}
+
+module.exports = {
+  deep: deep,
+  shallow: shallow
+};
diff --git a/node_modules/clean-css/lib/optimizer/level-2/compactable.js b/node_modules/clean-css/lib/optimizer/level-2/compactable.js
new file mode 100644
index 000000000..9cf334d44
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/compactable.js
@@ -0,0 +1,787 @@
+// Contains the interpretation of CSS properties, as used by the property optimizer
+
+var breakUp = require('./break-up');
+var canOverride = require('./can-override');
+var restore = require('./restore');
+
+var override = require('../../utils/override');
+
+// Properties to process
+// Extend this object in order to add support for more properties in the optimizer.
+//
+// Each key in this object represents a CSS property and should be an object.
+// Such an object contains properties that describe how the represented CSS property should be handled.
+// Possible options:
+//
+// * components: array (Only specify for shorthand properties.)
+//   Contains the names of the granular properties this shorthand compacts.
+//
+// * canOverride: function
+//   Returns whether two tokens of this property can be merged with each other.
+//   This property has no meaning for shorthands.
+//
+// * defaultValue: string
+//   Specifies the default value of the property according to the CSS standard.
+//   For shorthand, this is used when every component is set to its default value, therefore it should be the shortest possible default value of all the components.
+//
+// * shortestValue: string
+//   Specifies the shortest possible value the property can possibly have.
+//   (Falls back to defaultValue if unspecified.)
+//
+// * breakUp: function (Only specify for shorthand properties.)
+//   Breaks the shorthand up to its components.
+//
+// * restore: function (Only specify for shorthand properties.)
+//   Puts the shorthand together from its components.
+//
+var compactable = {
+  'background': {
+    canOverride: canOverride.generic.components([
+      canOverride.generic.image,
+      canOverride.property.backgroundPosition,
+      canOverride.property.backgroundSize,
+      canOverride.property.backgroundRepeat,
+      canOverride.property.backgroundAttachment,
+      canOverride.property.backgroundOrigin,
+      canOverride.property.backgroundClip,
+      canOverride.generic.color
+    ]),
+    components: [
+      'background-image',
+      'background-position',
+      'background-size',
+      'background-repeat',
+      'background-attachment',
+      'background-origin',
+      'background-clip',
+      'background-color'
+    ],
+    breakUp: breakUp.multiplex(breakUp.background),
+    defaultValue: '0 0',
+    restore: restore.multiplex(restore.background),
+    shortestValue: '0',
+    shorthand: true
+  },
+  'background-attachment': {
+    canOverride: canOverride.property.backgroundAttachment,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'scroll'
+  },
+  'background-clip': {
+    canOverride: canOverride.property.backgroundClip,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'border-box',
+    shortestValue: 'border-box'
+  },
+  'background-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'transparent',
+    multiplexLastOnly: true,
+    nonMergeableValue: 'none',
+    shortestValue: 'red'
+  },
+  'background-image': {
+    canOverride: canOverride.generic.image,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'none'
+  },
+  'background-origin': {
+    canOverride: canOverride.property.backgroundOrigin,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: 'padding-box',
+    shortestValue: 'border-box'
+  },
+  'background-position': {
+    canOverride: canOverride.property.backgroundPosition,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: ['0', '0'],
+    doubleValues: true,
+    shortestValue: '0'
+  },
+  'background-repeat': {
+    canOverride: canOverride.property.backgroundRepeat,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: ['repeat'],
+    doubleValues: true
+  },
+  'background-size': {
+    canOverride: canOverride.property.backgroundSize,
+    componentOf: [
+      'background'
+    ],
+    defaultValue: ['auto'],
+    doubleValues: true,
+    shortestValue: '0 0'
+  },
+  'bottom': {
+    canOverride: canOverride.property.bottom,
+    defaultValue: 'auto'
+  },
+  'border': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-width',
+      'border-style',
+      'border-color'
+    ],
+    defaultValue: 'none',
+    overridesShorthands: [
+      'border-bottom',
+      'border-left',
+      'border-right',
+      'border-top'
+    ],
+    restore: restore.withoutDefaults,
+    shorthand: true,
+    shorthandComponents: true
+  },
+  'border-bottom': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-bottom-width',
+      'border-bottom-style',
+      'border-bottom-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true
+  },
+  'border-bottom-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-bottom',
+      'border-color'
+    ],
+    defaultValue: 'none'
+  },
+  'border-bottom-left-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-bottom-right-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-bottom-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-bottom',
+      'border-style'
+    ],
+    defaultValue: 'none'
+  },
+  'border-bottom-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-bottom',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    shortestValue: '0'
+  },
+  'border-collapse': {
+    canOverride: canOverride.property.borderCollapse,
+    defaultValue: 'separate'
+  },
+  'border-color': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.color,
+      canOverride.generic.color,
+      canOverride.generic.color,
+      canOverride.generic.color
+    ]),
+    componentOf: ['border'],
+    components: [
+      'border-top-color',
+      'border-right-color',
+      'border-bottom-color',
+      'border-left-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.fourValues,
+    shortestValue: 'red',
+    shorthand: true
+  },
+  'border-left': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-left-width',
+      'border-left-style',
+      'border-left-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true
+  },
+  'border-left-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-color',
+      'border-left'
+    ],
+    defaultValue: 'none'
+  },
+  'border-left-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-left',
+      'border-style'
+    ],
+    defaultValue: 'none'
+  },
+  'border-left-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-left',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    shortestValue: '0'
+  },
+  'border-radius': {
+    breakUp: breakUp.borderRadius,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'border-top-left-radius',
+      'border-top-right-radius',
+      'border-bottom-right-radius',
+      'border-bottom-left-radius'
+    ],
+    defaultValue: '0',
+    restore: restore.borderRadius,
+    shorthand: true,
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-right': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-right-width',
+      'border-right-style',
+      'border-right-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true
+  },
+  'border-right-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-color',
+      'border-right'
+    ],
+    defaultValue: 'none'
+  },
+  'border-right-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-right',
+      'border-style'
+    ],
+    defaultValue: 'none'
+  },
+  'border-right-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-right',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    shortestValue: '0'
+  },
+  'border-style': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.property.borderStyle,
+      canOverride.property.borderStyle,
+      canOverride.property.borderStyle,
+      canOverride.property.borderStyle
+    ]),
+    componentOf: [
+      'border'
+    ],
+    components: [
+      'border-top-style',
+      'border-right-style',
+      'border-bottom-style',
+      'border-left-style'
+    ],
+    defaultValue: 'none',
+    restore: restore.fourValues,
+    shorthand: true
+  },
+  'border-top': {
+    breakUp: breakUp.border,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.property.borderStyle,
+      canOverride.generic.color
+    ]),
+    components: [
+      'border-top-width',
+      'border-top-style',
+      'border-top-color'
+    ],
+    defaultValue: 'none',
+    restore: restore.withoutDefaults,
+    shorthand: true
+  },
+  'border-top-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'border-color',
+      'border-top'
+    ],
+    defaultValue: 'none'
+  },
+  'border-top-left-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-top-right-radius': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-radius'
+    ],
+    defaultValue: '0',
+    vendorPrefixes: [
+      '-moz-',
+      '-o-'
+    ]
+  },
+  'border-top-style': {
+    canOverride: canOverride.property.borderStyle,
+    componentOf: [
+      'border-style',
+      'border-top'
+    ],
+    defaultValue: 'none'
+  },
+  'border-top-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'border-top',
+      'border-width'
+    ],
+    defaultValue: 'medium',
+    shortestValue: '0'
+  },
+  'border-width': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'border-top-width',
+      'border-right-width',
+      'border-bottom-width',
+      'border-left-width'
+    ],
+    defaultValue: 'medium',
+    restore: restore.fourValues,
+    shortestValue: '0',
+    shorthand: true
+  },
+  'clear': {
+    canOverride: canOverride.property.clear,
+    defaultValue: 'none'
+  },
+  'color': {
+    canOverride: canOverride.generic.color,
+    defaultValue: 'transparent',
+    shortestValue: 'red'
+  },
+  'cursor': {
+    canOverride: canOverride.property.cursor,
+    defaultValue: 'auto'
+  },
+  'display': {
+    canOverride: canOverride.property.display,
+  },
+  'float': {
+    canOverride: canOverride.property.float,
+    defaultValue: 'none'
+  },
+  'font-size': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'medium',
+    shortestValue: '0'
+  },
+  'font-style': {
+    canOverride: canOverride.property.fontStyle,
+    defaultValue: 'normal'
+  },
+  'font-weight': {
+    canOverride: canOverride.property.fontWeight,
+    defaultValue: '400',
+    shortestValue: '400'
+  },
+  'height': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'auto',
+    shortestValue: '0'
+  },
+  'left': {
+    canOverride: canOverride.property.left,
+    defaultValue: 'auto'
+  },
+  'line-height': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'normal',
+    shortestValue: '0'
+  },
+  'list-style': {
+    canOverride: canOverride.generic.components([
+      canOverride.property.listStyleType,
+      canOverride.property.listStylePosition,
+      canOverride.property.listStyleImage
+    ]),
+    components: [
+      'list-style-type',
+      'list-style-position',
+      'list-style-image'
+    ],
+    breakUp: breakUp.listStyle,
+    restore: restore.withoutDefaults,
+    defaultValue: 'outside', // can't use 'disc' because that'd override default 'decimal' for <ol>
+    shortestValue: 'none',
+    shorthand: true
+  },
+  'list-style-image' : {
+    canOverride: canOverride.generic.image,
+    componentOf: [
+      'list-style'
+    ],
+    defaultValue: 'none'
+  },
+  'list-style-position' : {
+    canOverride: canOverride.property.listStylePosition,
+    componentOf: [
+      'list-style'
+    ],
+    defaultValue: 'outside',
+    shortestValue: 'inside'
+  },
+  'list-style-type' : {
+    canOverride: canOverride.property.listStyleType,
+    componentOf: [
+      'list-style'
+    ],
+    // NOTE: we can't tell the real default value here, it's 'disc' for <ul> and 'decimal' for <ol>
+    // this is a hack, but it doesn't matter because this value will be either overridden or
+    // it will disappear at the final step anyway
+    defaultValue: 'decimal|disc',
+    shortestValue: 'none'
+  },
+  'margin': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'margin-top',
+      'margin-right',
+      'margin-bottom',
+      'margin-left'
+    ],
+    defaultValue: '0',
+    restore: restore.fourValues,
+    shorthand: true
+  },
+  'margin-bottom': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0'
+  },
+  'margin-left': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0'
+  },
+  'margin-right': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0'
+  },
+  'margin-top': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'margin'
+    ],
+    defaultValue: '0'
+  },
+  'outline': {
+    canOverride: canOverride.generic.components([
+      canOverride.generic.color,
+      canOverride.property.outlineStyle,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'outline-color',
+      'outline-style',
+      'outline-width'
+    ],
+    breakUp: breakUp.outline,
+    restore: restore.withoutDefaults,
+    defaultValue: '0',
+    shorthand: true
+  },
+  'outline-color': {
+    canOverride: canOverride.generic.color,
+    componentOf: [
+      'outline'
+    ],
+    defaultValue: 'invert',
+    shortestValue: 'red'
+  },
+  'outline-style': {
+    canOverride: canOverride.property.outlineStyle,
+    componentOf: [
+      'outline'
+    ],
+    defaultValue: 'none'
+  },
+  'outline-width': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'outline'
+    ],
+    defaultValue: 'medium',
+    shortestValue: '0'
+  },
+  'overflow': {
+    canOverride: canOverride.property.overflow,
+    defaultValue: 'visible'
+  },
+  'overflow-x': {
+    canOverride: canOverride.property.overflow,
+    defaultValue: 'visible'
+  },
+  'overflow-y': {
+    canOverride: canOverride.property.overflow,
+    defaultValue: 'visible'
+  },
+  'padding': {
+    breakUp: breakUp.fourValues,
+    canOverride: canOverride.generic.components([
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit,
+      canOverride.generic.unit
+    ]),
+    components: [
+      'padding-top',
+      'padding-right',
+      'padding-bottom',
+      'padding-left'
+    ],
+    defaultValue: '0',
+    restore: restore.fourValues,
+    shorthand: true
+  },
+  'padding-bottom': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0'
+  },
+  'padding-left': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0'
+  },
+  'padding-right': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0'
+  },
+  'padding-top': {
+    canOverride: canOverride.generic.unit,
+    componentOf: [
+      'padding'
+    ],
+    defaultValue: '0'
+  },
+  'position': {
+    canOverride: canOverride.property.position,
+    defaultValue: 'static'
+  },
+  'right': {
+    canOverride: canOverride.property.right,
+    defaultValue: 'auto'
+  },
+  'text-align': {
+    canOverride: canOverride.property.textAlign,
+    // NOTE: we can't tell the real default value here, as it depends on default text direction
+    // this is a hack, but it doesn't matter because this value will be either overridden or
+    // it will disappear anyway
+    defaultValue: 'left|right'
+  },
+  'text-decoration': {
+    canOverride: canOverride.property.textDecoration,
+    defaultValue: 'none'
+  },
+  'text-overflow': {
+    canOverride: canOverride.property.textOverflow,
+    defaultValue: 'none'
+  },
+  'text-shadow': {
+    canOverride: canOverride.property.textShadow,
+    defaultValue: 'none'
+  },
+  'top': {
+    canOverride: canOverride.property.top,
+    defaultValue: 'auto'
+  },
+  'transform': {
+    canOverride: canOverride.property.transform,
+    vendorPrefixes: [
+      '-moz-',
+      '-ms-',
+      '-webkit-'
+    ]
+  },
+  'vertical-align': {
+    canOverride: canOverride.property.verticalAlign,
+    defaultValue: 'baseline'
+  },
+  'visibility': {
+    canOverride: canOverride.property.visibility,
+    defaultValue: 'visible'
+  },
+  'white-space': {
+    canOverride: canOverride.property.whiteSpace,
+    defaultValue: 'normal'
+  },
+  'width': {
+    canOverride: canOverride.generic.unit,
+    defaultValue: 'auto',
+    shortestValue: '0'
+  },
+  'z-index': {
+    canOverride: canOverride.property.zIndex,
+    defaultValue: 'auto'
+  }
+};
+
+function cloneDescriptor(propertyName, prefix) {
+  var clonedDescriptor = override(compactable[propertyName], {});
+
+  if ('componentOf' in clonedDescriptor) {
+    clonedDescriptor.componentOf = clonedDescriptor.componentOf.map(function (shorthandName) {
+      return prefix + shorthandName;
+    });
+  }
+
+  if ('components' in clonedDescriptor) {
+    clonedDescriptor.components = clonedDescriptor.components.map(function (longhandName) {
+      return prefix + longhandName;
+    });
+  }
+
+  return clonedDescriptor;
+}
+
+// generate vendor-prefixed properties
+var vendorPrefixedCompactable = {};
+
+for (var propertyName in compactable) {
+  var descriptor = compactable[propertyName];
+
+  if (!('vendorPrefixes' in descriptor)) {
+    continue;
+  }
+
+  for (var i = 0; i < descriptor.vendorPrefixes.length; i++) {
+    var prefix = descriptor.vendorPrefixes[i];
+    var clonedDescriptor = cloneDescriptor(propertyName, prefix);
+    delete clonedDescriptor.vendorPrefixes;
+
+    vendorPrefixedCompactable[prefix + propertyName] = clonedDescriptor;
+  }
+
+  delete descriptor.vendorPrefixes;
+}
+
+module.exports = override(compactable, vendorPrefixedCompactable);
diff --git a/node_modules/clean-css/lib/optimizer/level-2/extract-properties.js b/node_modules/clean-css/lib/optimizer/level-2/extract-properties.js
new file mode 100644
index 000000000..8b9b1c2e0
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/extract-properties.js
@@ -0,0 +1,73 @@
+// This extractor is used in level 2 optimizations
+// IMPORTANT: Mind Token class and this code is not related!
+// Properties will be tokenized in one step, see #429
+
+var Token = require('../../tokenizer/token');
+var serializeRules = require('../../writer/one-time').rules;
+var serializeValue = require('../../writer/one-time').value;
+
+function extractProperties(token) {
+  var properties = [];
+  var inSpecificSelector;
+  var property;
+  var name;
+  var value;
+  var i, l;
+
+  if (token[0] == Token.RULE) {
+    inSpecificSelector = !/[\.\+>~]/.test(serializeRules(token[1]));
+
+    for (i = 0, l = token[2].length; i < l; i++) {
+      property = token[2][i];
+
+      if (property[0] != Token.PROPERTY)
+        continue;
+
+      name = property[1][1];
+      if (name.length === 0)
+        continue;
+
+      if (name.indexOf('--') === 0)
+        continue;
+
+      value = serializeValue(property, i);
+
+      properties.push([
+        name,
+        value,
+        findNameRoot(name),
+        token[2][i],
+        name + ':' + value,
+        token[1],
+        inSpecificSelector
+      ]);
+    }
+  } else if (token[0] == Token.NESTED_BLOCK) {
+    for (i = 0, l = token[2].length; i < l; i++) {
+      properties = properties.concat(extractProperties(token[2][i]));
+    }
+  }
+
+  return properties;
+}
+
+function findNameRoot(name) {
+  if (name == 'list-style')
+    return name;
+  if (name.indexOf('-radius') > 0)
+    return 'border-radius';
+  if (name == 'border-collapse' || name == 'border-spacing' || name == 'border-image')
+    return name;
+  if (name.indexOf('border-') === 0 && /^border\-\w+\-\w+$/.test(name))
+    return name.match(/border\-\w+/)[0];
+  if (name.indexOf('border-') === 0 && /^border\-\w+$/.test(name))
+    return 'border';
+  if (name.indexOf('text-') === 0)
+    return name;
+  if (name == '-chrome-')
+    return name;
+
+  return name.replace(/^\-\w+\-/, '').match(/([a-zA-Z]+)/)[0].toLowerCase();
+}
+
+module.exports = extractProperties;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/invalid-property-error.js b/node_modules/clean-css/lib/optimizer/level-2/invalid-property-error.js
new file mode 100644
index 000000000..86d5b5f9b
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/invalid-property-error.js
@@ -0,0 +1,10 @@
+function InvalidPropertyError(message) {
+  this.name = 'InvalidPropertyError';
+  this.message = message;
+  this.stack = (new Error()).stack;
+}
+
+InvalidPropertyError.prototype = Object.create(Error.prototype);
+InvalidPropertyError.prototype.constructor = InvalidPropertyError;
+
+module.exports = InvalidPropertyError;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/is-mergeable.js b/node_modules/clean-css/lib/optimizer/level-2/is-mergeable.js
new file mode 100644
index 000000000..4a91a8331
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/is-mergeable.js
@@ -0,0 +1,236 @@
+var Marker = require('../../tokenizer/marker');
+var split = require('../../utils/split');
+
+var DEEP_SELECTOR_PATTERN = /\/deep\//;
+var DOUBLE_COLON_PATTERN = /^::/;
+var NOT_PSEUDO = ':not';
+var PSEUDO_CLASSES_WITH_ARGUMENTS = [
+  ':dir',
+  ':lang',
+  ':not',
+  ':nth-child',
+  ':nth-last-child',
+  ':nth-last-of-type',
+  ':nth-of-type'
+];
+var RELATION_PATTERN = /[>\+~]/;
+
+var Level = {
+  DOUBLE_QUOTE: 'double-quote',
+  SINGLE_QUOTE: 'single-quote',
+  ROOT: 'root'
+};
+
+function isMergeable(selector, mergeablePseudoClasses, mergeablePseudoElements) {
+  var singleSelectors = split(selector, Marker.COMMA);
+  var singleSelector;
+  var i, l;
+
+  for (i = 0, l = singleSelectors.length; i < l; i++) {
+    singleSelector = singleSelectors[i];
+
+    if (singleSelector.length === 0 ||
+        isDeepSelector(singleSelector) ||
+        (singleSelector.indexOf(Marker.COLON) > -1 && !areMergeable(singleSelector, extractPseudoFrom(singleSelector), mergeablePseudoClasses, mergeablePseudoElements))) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function isDeepSelector(selector) {
+  return DEEP_SELECTOR_PATTERN.test(selector);
+}
+
+function extractPseudoFrom(selector) {
+  var list = [];
+  var character;
+  var buffer = [];
+  var level = Level.ROOT;
+  var roundBracketLevel = 0;
+  var isQuoted;
+  var isEscaped;
+  var isPseudo = false;
+  var isRelation;
+  var wasColon = false;
+  var index;
+  var len;
+
+  for (index = 0, len = selector.length; index < len; index++) {
+    character = selector[index];
+
+    isRelation = !isEscaped && RELATION_PATTERN.test(character);
+    isQuoted = level == Level.DOUBLE_QUOTE || level == Level.SINGLE_QUOTE;
+
+    if (isEscaped) {
+      buffer.push(character);
+    } else if (character == Marker.DOUBLE_QUOTE && level == Level.ROOT) {
+      buffer.push(character);
+      level = Level.DOUBLE_QUOTE;
+    } else if (character == Marker.DOUBLE_QUOTE && level == Level.DOUBLE_QUOTE) {
+      buffer.push(character);
+      level = Level.ROOT;
+    } else if (character == Marker.SINGLE_QUOTE && level == Level.ROOT) {
+      buffer.push(character);
+      level = Level.SINGLE_QUOTE;
+    } else if (character == Marker.SINGLE_QUOTE && level == Level.SINGLE_QUOTE) {
+      buffer.push(character);
+      level = Level.ROOT;
+    } else if (isQuoted) {
+      buffer.push(character);
+    } else if (character == Marker.OPEN_ROUND_BRACKET) {
+      buffer.push(character);
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && roundBracketLevel == 1 && isPseudo) {
+      buffer.push(character);
+      list.push(buffer.join(''));
+      roundBracketLevel--;
+      buffer = [];
+      isPseudo = false;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET) {
+      buffer.push(character);
+      roundBracketLevel--;
+    } else if (character == Marker.COLON && roundBracketLevel === 0 && isPseudo && !wasColon) {
+      list.push(buffer.join(''));
+      buffer = [];
+      buffer.push(character);
+    } else if (character == Marker.COLON && roundBracketLevel === 0 && !wasColon) {
+      buffer = [];
+      buffer.push(character);
+      isPseudo = true;
+    } else if (character == Marker.SPACE && roundBracketLevel === 0 && isPseudo) {
+      list.push(buffer.join(''));
+      buffer = [];
+      isPseudo = false;
+    } else if (isRelation && roundBracketLevel === 0 && isPseudo) {
+      list.push(buffer.join(''));
+      buffer = [];
+      isPseudo = false;
+    } else {
+      buffer.push(character);
+    }
+
+    isEscaped = character == Marker.BACK_SLASH;
+    wasColon = character == Marker.COLON;
+  }
+
+  if (buffer.length > 0 && isPseudo) {
+    list.push(buffer.join(''));
+  }
+
+  return list;
+}
+
+function areMergeable(selector, matches, mergeablePseudoClasses, mergeablePseudoElements) {
+  return areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements) &&
+    needArguments(matches) &&
+    (matches.length < 2 || !someIncorrectlyChained(selector, matches)) &&
+    (matches.length < 2 || !someMixed(matches));
+}
+
+function areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements) {
+  var match;
+  var name;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+    name = match.indexOf(Marker.OPEN_ROUND_BRACKET) > -1 ?
+      match.substring(0, match.indexOf(Marker.OPEN_ROUND_BRACKET)) :
+      match;
+
+    if (mergeablePseudoClasses.indexOf(name) === -1 && mergeablePseudoElements.indexOf(name) === -1) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function needArguments(matches) {
+  var match;
+  var name;
+  var bracketOpensAt;
+  var hasArguments;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+
+    bracketOpensAt = match.indexOf(Marker.OPEN_ROUND_BRACKET);
+    hasArguments = bracketOpensAt > -1;
+    name = hasArguments ?
+      match.substring(0, bracketOpensAt) :
+      match;
+
+    if (hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) == -1) {
+      return false;
+    }
+
+    if (!hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) > -1) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function someIncorrectlyChained(selector, matches) {
+  var positionInSelector = 0;
+  var match;
+  var matchAt;
+  var nextMatch;
+  var nextMatchAt;
+  var name;
+  var nextName;
+  var areChained;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+    nextMatch = matches[i + 1];
+
+    if (!nextMatch) {
+      break;
+    }
+
+    matchAt = selector.indexOf(match, positionInSelector);
+    nextMatchAt = selector.indexOf(match, matchAt + 1);
+    positionInSelector = nextMatchAt;
+    areChained = matchAt + match.length == nextMatchAt;
+
+    if (areChained) {
+      name = match.indexOf(Marker.OPEN_ROUND_BRACKET) > -1 ?
+        match.substring(0, match.indexOf(Marker.OPEN_ROUND_BRACKET)) :
+        match;
+      nextName = nextMatch.indexOf(Marker.OPEN_ROUND_BRACKET) > -1 ?
+        nextMatch.substring(0, nextMatch.indexOf(Marker.OPEN_ROUND_BRACKET)) :
+        nextMatch;
+
+      if (name != NOT_PSEUDO || nextName != NOT_PSEUDO) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function someMixed(matches) {
+  var firstIsPseudoElement = DOUBLE_COLON_PATTERN.test(matches[0]);
+  var match;
+  var i, l;
+
+  for (i = 0, l = matches.length; i < l; i++) {
+    match = matches[i];
+
+    if (DOUBLE_COLON_PATTERN.test(match) != firstIsPseudoElement) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+module.exports = isMergeable;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/merge-adjacent.js b/node_modules/clean-css/lib/optimizer/level-2/merge-adjacent.js
new file mode 100644
index 000000000..7c0537501
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/merge-adjacent.js
@@ -0,0 +1,49 @@
+var isMergeable = require('./is-mergeable');
+
+var optimizeProperties = require('./properties/optimize');
+
+var sortSelectors = require('../level-1/sort-selectors');
+var tidyRules = require('../level-1/tidy-rules');
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+var Token = require('../../tokenizer/token');
+
+function mergeAdjacent(tokens, context) {
+  var lastToken = [null, [], []];
+  var options = context.options;
+  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
+  var selectorsSortingMethod = options.level[OptimizationLevel.One].selectorsSortingMethod;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var mergeLimit = 8191;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    if (token[0] != Token.RULE) {
+      lastToken = [null, [], []];
+      continue;
+    }
+
+    if (lastToken[0] == Token.RULE && serializeRules(token[1]) == serializeRules(lastToken[1])) {
+      Array.prototype.push.apply(lastToken[2], token[2]);
+      optimizeProperties(lastToken[2], true, true, context);
+      token[2] = [];
+    } else if (lastToken[0] == Token.RULE && serializeBody(token[2]) == serializeBody(lastToken[2]) &&
+        isMergeable(serializeRules(token[1]), mergeablePseudoClasses, mergeablePseudoElements) &&
+        isMergeable(serializeRules(lastToken[1]), mergeablePseudoClasses, mergeablePseudoElements) &&
+        lastToken[1].length < mergeLimit) {
+      lastToken[1] = tidyRules(lastToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
+      lastToken[1] = lastToken.length > 1 ? sortSelectors(lastToken[1], selectorsSortingMethod) : lastToken[1];
+      token[2] = [];
+    } else {
+      lastToken = token;
+    }
+  }
+}
+
+module.exports = mergeAdjacent;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/merge-media-queries.js b/node_modules/clean-css/lib/optimizer/level-2/merge-media-queries.js
new file mode 100644
index 000000000..c3c60dc24
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/merge-media-queries.js
@@ -0,0 +1,103 @@
+var canReorder = require('./reorderable').canReorder;
+var canReorderSingle = require('./reorderable').canReorderSingle;
+var extractProperties = require('./extract-properties');
+var rulesOverlap = require('./rules-overlap');
+
+var serializeRules = require('../../writer/one-time').rules;
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+var Token = require('../../tokenizer/token');
+
+function mergeMediaQueries(tokens, context) {
+  var mergeSemantically = context.options.level[OptimizationLevel.Two].mergeSemantically;
+  var specificityCache = context.cache.specificity;
+  var candidates = {};
+  var reduced = [];
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+    if (token[0] != Token.NESTED_BLOCK) {
+      continue;
+    }
+
+    var key = serializeRules(token[1]);
+    var candidate = candidates[key];
+    if (!candidate) {
+      candidate = [];
+      candidates[key] = candidate;
+    }
+
+    candidate.push(i);
+  }
+
+  for (var name in candidates) {
+    var positions = candidates[name];
+
+    positionLoop:
+    for (var j = positions.length - 1; j > 0; j--) {
+      var positionOne = positions[j];
+      var tokenOne = tokens[positionOne];
+      var positionTwo = positions[j - 1];
+      var tokenTwo = tokens[positionTwo];
+
+      directionLoop:
+      for (var direction = 1; direction >= -1; direction -= 2) {
+        var topToBottom = direction == 1;
+        var from = topToBottom ? positionOne + 1 : positionTwo - 1;
+        var to = topToBottom ? positionTwo : positionOne;
+        var delta = topToBottom ? 1 : -1;
+        var source = topToBottom ? tokenOne : tokenTwo;
+        var target = topToBottom ? tokenTwo : tokenOne;
+        var movedProperties = extractProperties(source);
+
+        while (from != to) {
+          var traversedProperties = extractProperties(tokens[from]);
+          from += delta;
+
+          if (mergeSemantically && allSameRulePropertiesCanBeReordered(movedProperties, traversedProperties, specificityCache)) {
+            continue;
+          }
+
+          if (!canReorder(movedProperties, traversedProperties, specificityCache))
+            continue directionLoop;
+        }
+
+        target[2] = topToBottom ?
+          source[2].concat(target[2]) :
+          target[2].concat(source[2]);
+        source[2] = [];
+
+        reduced.push(target);
+        continue positionLoop;
+      }
+    }
+  }
+
+  return reduced;
+}
+
+function allSameRulePropertiesCanBeReordered(movedProperties, traversedProperties, specificityCache) {
+  var movedProperty;
+  var movedRule;
+  var traversedProperty;
+  var traversedRule;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = movedProperties.length; i < l; i++) {
+    movedProperty = movedProperties[i];
+    movedRule = movedProperty[5];
+
+    for (j = 0, m = traversedProperties.length; j < m; j++) {
+      traversedProperty = traversedProperties[j];
+      traversedRule = traversedProperty[5];
+
+      if (rulesOverlap(movedRule, traversedRule, true) && !canReorderSingle(movedProperty, traversedProperty, specificityCache)) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
+module.exports = mergeMediaQueries;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-body.js b/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-body.js
new file mode 100644
index 000000000..bdcf53ec0
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-body.js
@@ -0,0 +1,79 @@
+var isMergeable = require('./is-mergeable');
+
+var sortSelectors = require('../level-1/sort-selectors');
+var tidyRules = require('../level-1/tidy-rules');
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+var Token = require('../../tokenizer/token');
+
+function unsafeSelector(value) {
+  return /\.|\*| :/.test(value);
+}
+
+function isBemElement(token) {
+  var asString = serializeRules(token[1]);
+  return asString.indexOf('__') > -1 || asString.indexOf('--') > -1;
+}
+
+function withoutModifier(selector) {
+  return selector.replace(/--[^ ,>\+~:]+/g, '');
+}
+
+function removeAnyUnsafeElements(left, candidates) {
+  var leftSelector = withoutModifier(serializeRules(left[1]));
+
+  for (var body in candidates) {
+    var right = candidates[body];
+    var rightSelector = withoutModifier(serializeRules(right[1]));
+
+    if (rightSelector.indexOf(leftSelector) > -1 || leftSelector.indexOf(rightSelector) > -1)
+      delete candidates[body];
+  }
+}
+
+function mergeNonAdjacentByBody(tokens, context) {
+  var options = context.options;
+  var mergeSemantically = options.level[OptimizationLevel.Two].mergeSemantically;
+  var adjacentSpace = options.compatibility.selectors.adjacentSpace;
+  var selectorsSortingMethod = options.level[OptimizationLevel.One].selectorsSortingMethod;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var candidates = {};
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+    if (token[0] != Token.RULE)
+      continue;
+
+    if (token[2].length > 0 && (!mergeSemantically && unsafeSelector(serializeRules(token[1]))))
+      candidates = {};
+
+    if (token[2].length > 0 && mergeSemantically && isBemElement(token))
+      removeAnyUnsafeElements(token, candidates);
+
+    var candidateBody = serializeBody(token[2]);
+    var oldToken = candidates[candidateBody];
+    if (oldToken &&
+        isMergeable(serializeRules(token[1]), mergeablePseudoClasses, mergeablePseudoElements) &&
+        isMergeable(serializeRules(oldToken[1]), mergeablePseudoClasses, mergeablePseudoElements)) {
+
+      if (token[2].length > 0) {
+        token[1] = tidyRules(oldToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
+        token[1] = token[1].length > 1 ? sortSelectors(token[1], selectorsSortingMethod) : token[1];
+      } else {
+        token[1] = oldToken[1].concat(token[1]);
+      }
+
+      oldToken[2] = [];
+      candidates[candidateBody] = null;
+    }
+
+    candidates[serializeBody(token[2])] = token;
+  }
+}
+
+module.exports = mergeNonAdjacentByBody;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-selector.js b/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-selector.js
new file mode 100644
index 000000000..5e23064eb
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/merge-non-adjacent-by-selector.js
@@ -0,0 +1,78 @@
+var canReorder = require('./reorderable').canReorder;
+var extractProperties = require('./extract-properties');
+
+var optimizeProperties = require('./properties/optimize');
+
+var serializeRules = require('../../writer/one-time').rules;
+
+var Token = require('../../tokenizer/token');
+
+function mergeNonAdjacentBySelector(tokens, context) {
+  var specificityCache = context.cache.specificity;
+  var allSelectors = {};
+  var repeatedSelectors = [];
+  var i;
+
+  for (i = tokens.length - 1; i >= 0; i--) {
+    if (tokens[i][0] != Token.RULE)
+      continue;
+    if (tokens[i][2].length === 0)
+      continue;
+
+    var selector = serializeRules(tokens[i][1]);
+    allSelectors[selector] = [i].concat(allSelectors[selector] || []);
+
+    if (allSelectors[selector].length == 2)
+      repeatedSelectors.push(selector);
+  }
+
+  for (i = repeatedSelectors.length - 1; i >= 0; i--) {
+    var positions = allSelectors[repeatedSelectors[i]];
+
+    selectorIterator:
+    for (var j = positions.length - 1; j > 0; j--) {
+      var positionOne = positions[j - 1];
+      var tokenOne = tokens[positionOne];
+      var positionTwo = positions[j];
+      var tokenTwo = tokens[positionTwo];
+
+      directionIterator:
+      for (var direction = 1; direction >= -1; direction -= 2) {
+        var topToBottom = direction == 1;
+        var from = topToBottom ? positionOne + 1 : positionTwo - 1;
+        var to = topToBottom ? positionTwo : positionOne;
+        var delta = topToBottom ? 1 : -1;
+        var moved = topToBottom ? tokenOne : tokenTwo;
+        var target = topToBottom ? tokenTwo : tokenOne;
+        var movedProperties = extractProperties(moved);
+
+        while (from != to) {
+          var traversedProperties = extractProperties(tokens[from]);
+          from += delta;
+
+          // traversed then moved as we move selectors towards the start
+          var reorderable = topToBottom ?
+            canReorder(movedProperties, traversedProperties, specificityCache) :
+            canReorder(traversedProperties, movedProperties, specificityCache);
+
+          if (!reorderable && !topToBottom)
+            continue selectorIterator;
+          if (!reorderable && topToBottom)
+            continue directionIterator;
+        }
+
+        if (topToBottom) {
+          Array.prototype.push.apply(moved[2], target[2]);
+          target[2] = moved[2];
+        } else {
+          Array.prototype.push.apply(target[2], moved[2]);
+        }
+
+        optimizeProperties(target[2], true, true, context);
+        moved[2] = [];
+      }
+    }
+  }
+}
+
+module.exports = mergeNonAdjacentBySelector;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/optimize.js b/node_modules/clean-css/lib/optimizer/level-2/optimize.js
new file mode 100644
index 000000000..78cd44666
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/optimize.js
@@ -0,0 +1,124 @@
+var mergeAdjacent = require('./merge-adjacent');
+var mergeMediaQueries = require('./merge-media-queries');
+var mergeNonAdjacentByBody = require('./merge-non-adjacent-by-body');
+var mergeNonAdjacentBySelector = require('./merge-non-adjacent-by-selector');
+var reduceNonAdjacent = require('./reduce-non-adjacent');
+var removeDuplicateFontAtRules = require('./remove-duplicate-font-at-rules');
+var removeDuplicateMediaQueries = require('./remove-duplicate-media-queries');
+var removeDuplicates = require('./remove-duplicates');
+var restructure = require('./restructure');
+
+var optimizeProperties = require('./properties/optimize');
+
+var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
+
+var Token = require('../../tokenizer/token');
+
+function removeEmpty(tokens) {
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+    var isEmpty = false;
+
+    switch (token[0]) {
+      case Token.RULE:
+        isEmpty = token[1].length === 0 || token[2].length === 0;
+        break;
+      case Token.NESTED_BLOCK:
+        removeEmpty(token[2]);
+        isEmpty = token[2].length === 0;
+        break;
+      case Token.AT_RULE_BLOCK:
+        isEmpty = token[2].length === 0;
+    }
+
+    if (isEmpty) {
+      tokens.splice(i, 1);
+      i--;
+      l--;
+    }
+  }
+}
+
+function recursivelyOptimizeBlocks(tokens, context) {
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    if (token[0] == Token.NESTED_BLOCK) {
+      var isKeyframes = /@(-moz-|-o-|-webkit-)?keyframes/.test(token[1][0][1]);
+      level2Optimize(token[2], context, !isKeyframes);
+    }
+  }
+}
+
+function recursivelyOptimizeProperties(tokens, context) {
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    var token = tokens[i];
+
+    switch (token[0]) {
+      case Token.RULE:
+        optimizeProperties(token[2], true, true, context);
+        break;
+      case Token.NESTED_BLOCK:
+        recursivelyOptimizeProperties(token[2], context);
+    }
+  }
+}
+
+function level2Optimize(tokens, context, withRestructuring) {
+  var levelOptions = context.options.level[OptimizationLevel.Two];
+  var reduced;
+  var i;
+
+  recursivelyOptimizeBlocks(tokens, context);
+  recursivelyOptimizeProperties(tokens, context);
+
+  if (levelOptions.removeDuplicateRules) {
+    removeDuplicates(tokens, context);
+  }
+
+  if (levelOptions.mergeAdjacentRules) {
+    mergeAdjacent(tokens, context);
+  }
+
+  if (levelOptions.reduceNonAdjacentRules) {
+    reduceNonAdjacent(tokens, context);
+  }
+
+  if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'body') {
+    mergeNonAdjacentBySelector(tokens, context);
+  }
+
+  if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'selector') {
+    mergeNonAdjacentByBody(tokens, context);
+  }
+
+  if (levelOptions.restructureRules && levelOptions.mergeAdjacentRules && withRestructuring) {
+    restructure(tokens, context);
+    mergeAdjacent(tokens, context);
+  }
+
+  if (levelOptions.restructureRules && !levelOptions.mergeAdjacentRules && withRestructuring) {
+    restructure(tokens, context);
+  }
+
+  if (levelOptions.removeDuplicateFontRules) {
+    removeDuplicateFontAtRules(tokens, context);
+  }
+
+  if (levelOptions.removeDuplicateMediaBlocks) {
+    removeDuplicateMediaQueries(tokens, context);
+  }
+
+  if (levelOptions.mergeMedia) {
+    reduced = mergeMediaQueries(tokens, context);
+    for (i = reduced.length - 1; i >= 0; i--) {
+      level2Optimize(reduced[i][2], context, false);
+    }
+  }
+
+  removeEmpty(tokens);
+
+  return tokens;
+}
+
+module.exports = level2Optimize;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/every-values-pair.js b/node_modules/clean-css/lib/optimizer/level-2/properties/every-values-pair.js
new file mode 100644
index 000000000..44fcb7d53
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/every-values-pair.js
@@ -0,0 +1,28 @@
+var Marker = require('../../../tokenizer/marker');
+
+function everyValuesPair(fn, left, right) {
+  var leftSize = left.value.length;
+  var rightSize = right.value.length;
+  var total = Math.max(leftSize, rightSize);
+  var lowerBound = Math.min(leftSize, rightSize) - 1;
+  var leftValue;
+  var rightValue;
+  var position;
+
+  for (position = 0; position < total; position++) {
+    leftValue = left.value[position] && left.value[position][1] || leftValue;
+    rightValue = right.value[position] && right.value[position][1] || rightValue;
+
+    if (leftValue == Marker.COMMA || rightValue == Marker.COMMA) {
+      continue;
+    }
+
+    if (!fn(leftValue, rightValue, position, position <= lowerBound)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+module.exports = everyValuesPair;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/find-component-in.js b/node_modules/clean-css/lib/optimizer/level-2/properties/find-component-in.js
new file mode 100644
index 000000000..dd7c719d5
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/find-component-in.js
@@ -0,0 +1,40 @@
+var compactable = require('../compactable');
+
+function findComponentIn(shorthand, longhand) {
+  var comparator = nameComparator(longhand);
+
+  return findInDirectComponents(shorthand, comparator) || findInSubComponents(shorthand, comparator);
+}
+
+function nameComparator(to) {
+  return function (property) {
+    return to.name === property.name;
+  };
+}
+
+function findInDirectComponents(shorthand, comparator) {
+  return shorthand.components.filter(comparator)[0];
+}
+
+function findInSubComponents(shorthand, comparator) {
+  var shorthandComponent;
+  var longhandMatch;
+  var i, l;
+
+  if (!compactable[shorthand.name].shorthandComponents) {
+    return;
+  }
+
+  for (i = 0, l = shorthand.components.length; i < l; i++) {
+    shorthandComponent = shorthand.components[i];
+    longhandMatch = findInDirectComponents(shorthandComponent, comparator);
+
+    if (longhandMatch) {
+      return longhandMatch;
+    }
+  }
+
+  return;
+}
+
+module.exports = findComponentIn;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/has-inherit.js b/node_modules/clean-css/lib/optimizer/level-2/properties/has-inherit.js
new file mode 100644
index 000000000..84f220d32
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/has-inherit.js
@@ -0,0 +1,10 @@
+function hasInherit(property) {
+  for (var i = property.value.length - 1; i >= 0; i--) {
+    if (property.value[i][1] == 'inherit')
+      return true;
+  }
+
+  return false;
+}
+
+module.exports = hasInherit;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/is-component-of.js b/node_modules/clean-css/lib/optimizer/level-2/properties/is-component-of.js
new file mode 100644
index 000000000..237de7d10
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/is-component-of.js
@@ -0,0 +1,22 @@
+var compactable = require('../compactable');
+
+function isComponentOf(property1, property2, shallow) {
+  return isDirectComponentOf(property1, property2) ||
+    !shallow && !!compactable[property1.name].shorthandComponents && isSubComponentOf(property1, property2);
+}
+
+function isDirectComponentOf(property1, property2) {
+  var descriptor = compactable[property1.name];
+
+  return 'components' in descriptor && descriptor.components.indexOf(property2.name) > -1;
+}
+
+function isSubComponentOf(property1, property2) {
+  return property1
+    .components
+    .some(function (component) {
+      return isDirectComponentOf(component, property2);
+    });
+}
+
+module.exports = isComponentOf;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/merge-into-shorthands.js b/node_modules/clean-css/lib/optimizer/level-2/properties/merge-into-shorthands.js
new file mode 100644
index 000000000..a75c4ed63
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/merge-into-shorthands.js
@@ -0,0 +1,157 @@
+var everyValuesPair = require('./every-values-pair');
+var hasInherit = require('./has-inherit');
+var populateComponents = require('./populate-components');
+
+var compactable = require('../compactable');
+var deepClone = require('../clone').deep;
+
+var wrapSingle = require('../../wrap-for-optimizing').single;
+
+var Token = require('../../../tokenizer/token');
+
+function mixedImportance(components) {
+  var important;
+
+  for (var name in components) {
+    if (undefined !== important && components[name].important != important)
+      return true;
+
+    important = components[name].important;
+  }
+
+  return false;
+}
+
+function joinMetadata(components, at) {
+  var metadata = [];
+  var component;
+  var originalValue;
+  var componentMetadata;
+  var name;
+
+  for (name in components) {
+    component = components[name];
+    originalValue = component.all[component.position];
+    componentMetadata = originalValue[at][originalValue[at].length - 1];
+
+    Array.prototype.push.apply(metadata, componentMetadata);
+  }
+
+  return metadata;
+}
+
+function replaceWithShorthand(properties, candidateComponents, name, validator) {
+  var descriptor = compactable[name];
+  var nameMetadata;
+  var valueMetadata;
+  var newValuePlaceholder = [
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, name],
+    [Token.PROPERTY_VALUE, descriptor.defaultValue]
+  ];
+  var mayOverride;
+  var all;
+
+  var newProperty = wrapSingle(newValuePlaceholder);
+  newProperty.shorthand = true;
+  newProperty.dirty = true;
+
+  populateComponents([newProperty], validator, []);
+
+  for (var i = 0, l = descriptor.components.length; i < l; i++) {
+    var component = candidateComponents[descriptor.components[i]];
+
+    if (hasInherit(component))
+      return;
+
+    mayOverride = compactable[component.name].canOverride;
+    if (!everyValuesPair(mayOverride.bind(null, validator), newProperty.components[i], component))
+      return;
+
+    newProperty.components[i] = deepClone(component);
+    newProperty.important = component.important;
+
+    all = component.all;
+  }
+
+  for (var componentName in candidateComponents) {
+    candidateComponents[componentName].unused = true;
+  }
+
+  nameMetadata = joinMetadata(candidateComponents, 1);
+  newValuePlaceholder[1].push(nameMetadata);
+
+  valueMetadata = joinMetadata(candidateComponents, 2);
+  newValuePlaceholder[2].push(valueMetadata);
+
+  newProperty.position = all.length;
+  newProperty.all = all;
+  newProperty.all.push(newValuePlaceholder);
+
+  properties.push(newProperty);
+}
+
+function invalidateOrCompact(properties, position, candidates, validator) {
+  var property = properties[position];
+
+  for (var name in candidates) {
+    if (undefined !== property && name == property.name)
+      continue;
+
+    var descriptor = compactable[name];
+    var candidateComponents = candidates[name];
+    if (descriptor.components.length > Object.keys(candidateComponents).length) {
+      delete candidates[name];
+      continue;
+    }
+
+    if (mixedImportance(candidateComponents))
+      continue;
+
+    replaceWithShorthand(properties, candidateComponents, name, validator);
+  }
+}
+
+function mergeIntoShorthands(properties, validator) {
+  var candidates = {};
+  var descriptor;
+  var componentOf;
+  var property;
+  var i, l;
+  var j, m;
+
+  if (properties.length < 3)
+    return;
+
+  for (i = 0, l = properties.length; i < l; i++) {
+    property = properties[i];
+
+    if (property.unused)
+      continue;
+
+    if (property.hack)
+      continue;
+
+    if (property.block)
+      continue;
+
+    descriptor = compactable[property.name];
+    if (!descriptor || !descriptor.componentOf)
+      continue;
+
+    if (property.shorthand) {
+      invalidateOrCompact(properties, i, candidates, validator);
+    } else {
+      for (j = 0, m = descriptor.componentOf.length; j < m; j++) {
+        componentOf = descriptor.componentOf[j];
+
+        candidates[componentOf] = candidates[componentOf] || {};
+        candidates[componentOf][property.name] = property;
+      }
+    }
+  }
+
+  invalidateOrCompact(properties, i, candidates, validator);
+}
+
+module.exports = mergeIntoShorthands;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/optimize.js b/node_modules/clean-css/lib/optimizer/level-2/properties/optimize.js
new file mode 100644
index 000000000..250b05fc4
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/optimize.js
@@ -0,0 +1,39 @@
+var mergeIntoShorthands = require('./merge-into-shorthands');
+var overrideProperties = require('./override-properties');
+var populateComponents = require('./populate-components');
+
+var restoreWithComponents = require('../restore-with-components');
+
+var wrapForOptimizing = require('../../wrap-for-optimizing').all;
+var removeUnused = require('../../remove-unused');
+var restoreFromOptimizing = require('../../restore-from-optimizing');
+
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+function optimizeProperties(properties, withOverriding, withMerging, context) {
+  var _properties = wrapForOptimizing(properties, false);
+  var _property;
+  var i, l;
+
+  populateComponents(_properties, context.validator, context.warnings);
+
+  for (i = 0, l = _properties.length; i < l; i++) {
+    _property = _properties[i];
+    if (_property.block) {
+      optimizeProperties(_property.value[0][1], withOverriding, withMerging, context);
+    }
+  }
+
+  if (withOverriding && context.options.level[OptimizationLevel.Two].overrideProperties) {
+    overrideProperties(_properties, withMerging, context.options.compatibility, context.validator);
+  }
+
+  if (withMerging && context.options.level[OptimizationLevel.Two].mergeIntoShorthands) {
+    mergeIntoShorthands(_properties, context.validator);
+  }
+
+  restoreFromOptimizing(_properties, restoreWithComponents);
+  removeUnused(_properties);
+}
+
+module.exports = optimizeProperties;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/override-properties.js b/node_modules/clean-css/lib/optimizer/level-2/properties/override-properties.js
new file mode 100644
index 000000000..3c9d8d2af
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/override-properties.js
@@ -0,0 +1,441 @@
+var hasInherit = require('./has-inherit');
+var everyValuesPair = require('./every-values-pair');
+var findComponentIn = require('./find-component-in');
+var isComponentOf = require('./is-component-of');
+var overridesNonComponentShorthand = require('./overrides-non-component-shorthand');
+var sameVendorPrefixesIn = require('./vendor-prefixes').same;
+
+var compactable = require('../compactable');
+var deepClone = require('../clone').deep;
+var deepClone = require('../clone').deep;
+var restoreWithComponents = require('../restore-with-components');
+var shallowClone = require('../clone').shallow;
+
+var restoreFromOptimizing = require('../../restore-from-optimizing');
+
+var Token = require('../../../tokenizer/token');
+var Marker = require('../../../tokenizer/marker');
+
+var serializeProperty = require('../../../writer/one-time').property;
+
+function wouldBreakCompatibility(property, validator) {
+  for (var i = 0; i < property.components.length; i++) {
+    var component = property.components[i];
+    var descriptor = compactable[component.name];
+    var canOverride = descriptor && descriptor.canOverride || canOverride.sameValue;
+
+    var _component = shallowClone(component);
+    _component.value = [[Token.PROPERTY_VALUE, descriptor.defaultValue]];
+
+    if (!everyValuesPair(canOverride.bind(null, validator), _component, component)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function overrideIntoMultiplex(property, by) {
+  by.unused = true;
+
+  turnIntoMultiplex(by, multiplexSize(property));
+  property.value = by.value;
+}
+
+function overrideByMultiplex(property, by) {
+  by.unused = true;
+  property.multiplex = true;
+  property.value = by.value;
+}
+
+function overrideSimple(property, by) {
+  by.unused = true;
+  property.value = by.value;
+}
+
+function override(property, by) {
+  if (by.multiplex)
+    overrideByMultiplex(property, by);
+  else if (property.multiplex)
+    overrideIntoMultiplex(property, by);
+  else
+    overrideSimple(property, by);
+}
+
+function overrideShorthand(property, by) {
+  by.unused = true;
+
+  for (var i = 0, l = property.components.length; i < l; i++) {
+    override(property.components[i], by.components[i], property.multiplex);
+  }
+}
+
+function turnIntoMultiplex(property, size) {
+  property.multiplex = true;
+
+  for (var i = 0, l = property.components.length; i < l; i++) {
+    var component = property.components[i];
+    if (component.multiplex)
+      continue;
+
+    var value = component.value.slice(0);
+
+    for (var j = 1; j < size; j++) {
+      component.value.push([Token.PROPERTY_VALUE, Marker.COMMA]);
+      Array.prototype.push.apply(component.value, value);
+    }
+  }
+}
+
+function multiplexSize(component) {
+  var size = 0;
+
+  for (var i = 0, l = component.value.length; i < l; i++) {
+    if (component.value[i][1] == Marker.COMMA)
+      size++;
+  }
+
+  return size + 1;
+}
+
+function lengthOf(property) {
+  var fakeAsArray = [
+    Token.PROPERTY,
+    [Token.PROPERTY_NAME, property.name]
+  ].concat(property.value);
+  return serializeProperty([fakeAsArray], 0).length;
+}
+
+function moreSameShorthands(properties, startAt, name) {
+  // Since we run the main loop in `compactOverrides` backwards, at this point some
+  // properties may not be marked as unused.
+  // We should consider reverting the order if possible
+  var count = 0;
+
+  for (var i = startAt; i >= 0; i--) {
+    if (properties[i].name == name && !properties[i].unused)
+      count++;
+    if (count > 1)
+      break;
+  }
+
+  return count > 1;
+}
+
+function overridingFunction(shorthand, validator) {
+  for (var i = 0, l = shorthand.components.length; i < l; i++) {
+    if (anyValue(validator.isValidFunction, shorthand.components[i]))
+      return true;
+  }
+
+  return false;
+}
+
+function anyValue(fn, property) {
+  for (var i = 0, l = property.value.length; i < l; i++) {
+    if (property.value[i][1] == Marker.COMMA)
+      continue;
+
+    if (fn(property.value[i][1]))
+      return true;
+  }
+
+  return false;
+}
+
+function wouldResultInLongerValue(left, right) {
+  if (!left.multiplex && !right.multiplex || left.multiplex && right.multiplex)
+    return false;
+
+  var multiplex = left.multiplex ? left : right;
+  var simple = left.multiplex ? right : left;
+  var component;
+
+  var multiplexClone = deepClone(multiplex);
+  restoreFromOptimizing([multiplexClone], restoreWithComponents);
+
+  var simpleClone = deepClone(simple);
+  restoreFromOptimizing([simpleClone], restoreWithComponents);
+
+  var lengthBefore = lengthOf(multiplexClone) + 1 + lengthOf(simpleClone);
+
+  if (left.multiplex) {
+    component = findComponentIn(multiplexClone, simpleClone);
+    overrideIntoMultiplex(component, simpleClone);
+  } else {
+    component = findComponentIn(simpleClone, multiplexClone);
+    turnIntoMultiplex(simpleClone, multiplexSize(multiplexClone));
+    overrideByMultiplex(component, multiplexClone);
+  }
+
+  restoreFromOptimizing([simpleClone], restoreWithComponents);
+
+  var lengthAfter = lengthOf(simpleClone);
+
+  return lengthBefore <= lengthAfter;
+}
+
+function isCompactable(property) {
+  return property.name in compactable;
+}
+
+function noneOverrideHack(left, right) {
+  return !left.multiplex &&
+    (left.name == 'background' || left.name == 'background-image') &&
+    right.multiplex &&
+    (right.name == 'background' || right.name == 'background-image') &&
+    anyLayerIsNone(right.value);
+}
+
+function anyLayerIsNone(values) {
+  var layers = intoLayers(values);
+
+  for (var i = 0, l = layers.length; i < l; i++) {
+    if (layers[i].length == 1 && layers[i][0][1] == 'none')
+      return true;
+  }
+
+  return false;
+}
+
+function intoLayers(values) {
+  var layers = [];
+
+  for (var i = 0, layer = [], l = values.length; i < l; i++) {
+    var value = values[i];
+    if (value[1] == Marker.COMMA) {
+      layers.push(layer);
+      layer = [];
+    } else {
+      layer.push(value);
+    }
+  }
+
+  layers.push(layer);
+  return layers;
+}
+
+function overrideProperties(properties, withMerging, compatibility, validator) {
+  var mayOverride, right, left, component;
+  var overriddenComponents;
+  var overriddenComponent;
+  var overridingComponent;
+  var overridable;
+  var i, j, k;
+
+  propertyLoop:
+  for (i = properties.length - 1; i >= 0; i--) {
+    right = properties[i];
+
+    if (!isCompactable(right))
+      continue;
+
+    if (right.block)
+      continue;
+
+    mayOverride = compactable[right.name].canOverride;
+
+    traverseLoop:
+    for (j = i - 1; j >= 0; j--) {
+      left = properties[j];
+
+      if (!isCompactable(left))
+        continue;
+
+      if (left.block)
+        continue;
+
+      if (left.unused || right.unused)
+        continue;
+
+      if (left.hack && !right.hack && !right.important || !left.hack && !left.important && right.hack)
+        continue;
+
+      if (left.important == right.important && left.hack[0] != right.hack[0])
+        continue;
+
+      if (left.important == right.important && (left.hack[0] != right.hack[0] || (left.hack[1] && left.hack[1] != right.hack[1])))
+        continue;
+
+      if (hasInherit(right))
+        continue;
+
+      if (noneOverrideHack(left, right))
+        continue;
+
+      if (right.shorthand && isComponentOf(right, left)) {
+        // maybe `left` can be overridden by `right` which is a shorthand?
+        if (!right.important && left.important)
+          continue;
+
+        if (!sameVendorPrefixesIn([left], right.components))
+          continue;
+
+        if (!anyValue(validator.isValidFunction, left) && overridingFunction(right, validator))
+          continue;
+
+        component = findComponentIn(right, left);
+        mayOverride = compactable[left.name].canOverride;
+        if (everyValuesPair(mayOverride.bind(null, validator), left, component)) {
+          left.unused = true;
+        }
+      } else if (right.shorthand && overridesNonComponentShorthand(right, left)) {
+        // `right` is a shorthand while `left` can be overriden by it, think `border` and `border-top`
+        if (!right.important && left.important) {
+          continue;
+        }
+
+        if (!sameVendorPrefixesIn([left], right.components)) {
+          continue;
+        }
+
+        if (!anyValue(validator.isValidFunction, left) && overridingFunction(right, validator)) {
+          continue;
+        }
+
+        overriddenComponents = left.shorthand ?
+          left.components:
+          [left];
+
+        for (k = overriddenComponents.length - 1; k >= 0; k--) {
+          overriddenComponent = overriddenComponents[k];
+          overridingComponent = findComponentIn(right, overriddenComponent);
+          mayOverride = compactable[overriddenComponent.name].canOverride;
+
+          if (!everyValuesPair(mayOverride.bind(null, validator), left, overridingComponent)) {
+            continue traverseLoop;
+          }
+        }
+
+        left.unused = true;
+      } else if (withMerging && left.shorthand && !right.shorthand && isComponentOf(left, right, true)) {
+        // maybe `right` can be pulled into `left` which is a shorthand?
+        if (right.important && !left.important)
+          continue;
+
+        if (!right.important && left.important) {
+          right.unused = true;
+          continue;
+        }
+
+        // Pending more clever algorithm in #527
+        if (moreSameShorthands(properties, i - 1, left.name))
+          continue;
+
+        if (overridingFunction(left, validator))
+          continue;
+
+        component = findComponentIn(left, right);
+        if (everyValuesPair(mayOverride.bind(null, validator), component, right)) {
+          var disabledBackgroundMerging =
+            !compatibility.properties.backgroundClipMerging && component.name.indexOf('background-clip') > -1 ||
+            !compatibility.properties.backgroundOriginMerging && component.name.indexOf('background-origin') > -1 ||
+            !compatibility.properties.backgroundSizeMerging && component.name.indexOf('background-size') > -1;
+          var nonMergeableValue = compactable[right.name].nonMergeableValue === right.value[0][1];
+
+          if (disabledBackgroundMerging || nonMergeableValue)
+            continue;
+
+          if (!compatibility.properties.merging && wouldBreakCompatibility(left, validator))
+            continue;
+
+          if (component.value[0][1] != right.value[0][1] && (hasInherit(left) || hasInherit(right)))
+            continue;
+
+          if (wouldResultInLongerValue(left, right))
+            continue;
+
+          if (!left.multiplex && right.multiplex)
+            turnIntoMultiplex(left, multiplexSize(right));
+
+          override(component, right);
+          left.dirty = true;
+        }
+      } else if (withMerging && left.shorthand && right.shorthand && left.name == right.name) {
+        // merge if all components can be merged
+
+        if (!left.multiplex && right.multiplex)
+          continue;
+
+        if (!right.important && left.important) {
+          right.unused = true;
+          continue propertyLoop;
+        }
+
+        if (right.important && !left.important) {
+          left.unused = true;
+          continue;
+        }
+
+        for (k = left.components.length - 1; k >= 0; k--) {
+          var leftComponent = left.components[k];
+          var rightComponent = right.components[k];
+
+          mayOverride = compactable[leftComponent.name].canOverride;
+          if (!everyValuesPair(mayOverride.bind(null, validator), leftComponent, rightComponent))
+            continue propertyLoop;
+        }
+
+        overrideShorthand(left, right);
+        left.dirty = true;
+      } else if (withMerging && left.shorthand && right.shorthand && isComponentOf(left, right)) {
+        // border is a shorthand but any of its components is a shorthand too
+
+        if (!left.important && right.important)
+          continue;
+
+        component = findComponentIn(left, right);
+        mayOverride = compactable[right.name].canOverride;
+        if (!everyValuesPair(mayOverride.bind(null, validator), component, right))
+          continue;
+
+        if (left.important && !right.important) {
+          right.unused = true;
+          continue;
+        }
+
+        var rightRestored = compactable[right.name].restore(right, compactable);
+        if (rightRestored.length > 1)
+          continue;
+
+        component = findComponentIn(left, right);
+        override(component, right);
+        right.dirty = true;
+      } else if (left.name == right.name) {
+        // two non-shorthands should be merged based on understandability
+        overridable = true;
+
+        if (right.shorthand) {
+          for (k = right.components.length - 1; k >= 0 && overridable; k--) {
+            overriddenComponent = left.components[k];
+            overridingComponent = right.components[k];
+            mayOverride = compactable[overridingComponent.name].canOverride;
+
+            overridable = overridable && everyValuesPair(mayOverride.bind(null, validator), overriddenComponent, overridingComponent);
+          }
+        } else {
+          mayOverride = compactable[right.name].canOverride;
+          overridable = everyValuesPair(mayOverride.bind(null, validator), left, right);
+        }
+
+        if (left.important && !right.important && overridable) {
+          right.unused = true;
+          continue;
+        }
+
+        if (!left.important && right.important && overridable) {
+          left.unused = true;
+          continue;
+        }
+
+        if (!overridable) {
+          continue;
+        }
+
+        left.unused = true;
+      }
+    }
+  }
+}
+
+module.exports = overrideProperties;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/overrides-non-component-shorthand.js b/node_modules/clean-css/lib/optimizer/level-2/properties/overrides-non-component-shorthand.js
new file mode 100644
index 000000000..c385218a9
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/overrides-non-component-shorthand.js
@@ -0,0 +1,9 @@
+var compactable = require('../compactable');
+
+function overridesNonComponentShorthand(property1, property2) {
+  return property1.name in compactable &&
+    'overridesShorthands' in compactable[property1.name] &&
+    compactable[property1.name].overridesShorthands.indexOf(property2.name) > -1;
+}
+
+module.exports = overridesNonComponentShorthand;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/populate-components.js b/node_modules/clean-css/lib/optimizer/level-2/properties/populate-components.js
new file mode 100644
index 000000000..c587e83c4
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/populate-components.js
@@ -0,0 +1,42 @@
+var compactable = require('../compactable');
+var InvalidPropertyError = require('../invalid-property-error');
+
+function populateComponents(properties, validator, warnings) {
+  var component;
+  var j, m;
+
+  for (var i = properties.length - 1; i >= 0; i--) {
+    var property = properties[i];
+    var descriptor = compactable[property.name];
+
+    if (descriptor && descriptor.shorthand) {
+      property.shorthand = true;
+      property.dirty = true;
+
+      try {
+        property.components = descriptor.breakUp(property, compactable, validator);
+
+        if (descriptor.shorthandComponents) {
+          for (j = 0, m = property.components.length; j < m; j++) {
+            component = property.components[j];
+            component.components = compactable[component.name].breakUp(component, compactable, validator);
+          }
+        }
+      } catch (e) {
+        if (e instanceof InvalidPropertyError) {
+          property.components = []; // this will set property.unused to true below
+          warnings.push(e.message);
+        } else {
+          throw e;
+        }
+      }
+
+      if (property.components.length > 0)
+        property.multiplex = property.components[0].multiplex;
+      else
+        property.unused = true;
+    }
+  }
+}
+
+module.exports = populateComponents;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/understandable.js b/node_modules/clean-css/lib/optimizer/level-2/properties/understandable.js
new file mode 100644
index 000000000..6c77db50d
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/understandable.js
@@ -0,0 +1,15 @@
+var sameVendorPrefixes = require('./vendor-prefixes').same;
+
+function understandable(validator, value1, value2, _position, isPaired) {
+  if (!sameVendorPrefixes(value1, value2)) {
+    return false;
+  }
+
+  if (isPaired && validator.isValidVariable(value1) !== validator.isValidVariable(value2)) {
+    return false;
+  }
+
+  return true;
+}
+
+module.exports = understandable;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/properties/vendor-prefixes.js b/node_modules/clean-css/lib/optimizer/level-2/properties/vendor-prefixes.js
new file mode 100644
index 000000000..f9ab52728
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/properties/vendor-prefixes.js
@@ -0,0 +1,23 @@
+var VENDOR_PREFIX_PATTERN = /(?:^|\W)(\-\w+\-)/g;
+
+function unique(value) {
+  var prefixes = [];
+  var match;
+
+  while ((match = VENDOR_PREFIX_PATTERN.exec(value)) !== null) {
+    if (prefixes.indexOf(match[0]) == -1) {
+      prefixes.push(match[0]);
+    }
+  }
+
+  return prefixes;
+}
+
+function same(value1, value2) {
+  return unique(value1).sort().join(',') == unique(value2).sort().join(',');
+}
+
+module.exports = {
+  unique: unique,
+  same: same
+};
diff --git a/node_modules/clean-css/lib/optimizer/level-2/reduce-non-adjacent.js b/node_modules/clean-css/lib/optimizer/level-2/reduce-non-adjacent.js
new file mode 100644
index 000000000..3461bb268
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/reduce-non-adjacent.js
@@ -0,0 +1,178 @@
+var isMergeable = require('./is-mergeable');
+
+var optimizeProperties = require('./properties/optimize');
+
+var cloneArray = require('../../utils/clone-array');
+
+var Token = require('../../tokenizer/token');
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+function reduceNonAdjacent(tokens, context) {
+  var options = context.options;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var candidates = {};
+  var repeated = [];
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+
+    if (token[0] != Token.RULE) {
+      continue;
+    } else if (token[2].length === 0) {
+      continue;
+    }
+
+    var selectorAsString = serializeRules(token[1]);
+    var isComplexAndNotSpecial = token[1].length > 1 &&
+      isMergeable(selectorAsString, mergeablePseudoClasses, mergeablePseudoElements);
+    var wrappedSelectors = wrappedSelectorsFrom(token[1]);
+    var selectors = isComplexAndNotSpecial ?
+      [selectorAsString].concat(wrappedSelectors) :
+      [selectorAsString];
+
+    for (var j = 0, m = selectors.length; j < m; j++) {
+      var selector = selectors[j];
+
+      if (!candidates[selector])
+        candidates[selector] = [];
+      else
+        repeated.push(selector);
+
+      candidates[selector].push({
+        where: i,
+        list: wrappedSelectors,
+        isPartial: isComplexAndNotSpecial && j > 0,
+        isComplex: isComplexAndNotSpecial && j === 0
+      });
+    }
+  }
+
+  reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context);
+  reduceComplexNonAdjacentCases(tokens, candidates, options, context);
+}
+
+function wrappedSelectorsFrom(list) {
+  var wrapped = [];
+
+  for (var i = 0; i < list.length; i++) {
+    wrapped.push([list[i][1]]);
+  }
+
+  return wrapped;
+}
+
+function reduceSimpleNonAdjacentCases(tokens, repeated, candidates, options, context) {
+  function filterOut(idx, bodies) {
+    return data[idx].isPartial && bodies.length === 0;
+  }
+
+  function reduceBody(token, newBody, processedCount, tokenIdx) {
+    if (!data[processedCount - tokenIdx - 1].isPartial)
+      token[2] = newBody;
+  }
+
+  for (var i = 0, l = repeated.length; i < l; i++) {
+    var selector = repeated[i];
+    var data = candidates[selector];
+
+    reduceSelector(tokens, data, {
+      filterOut: filterOut,
+      callback: reduceBody
+    }, options, context);
+  }
+}
+
+function reduceComplexNonAdjacentCases(tokens, candidates, options, context) {
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var localContext = {};
+
+  function filterOut(idx) {
+    return localContext.data[idx].where < localContext.intoPosition;
+  }
+
+  function collectReducedBodies(token, newBody, processedCount, tokenIdx) {
+    if (tokenIdx === 0)
+      localContext.reducedBodies.push(newBody);
+  }
+
+  allSelectors:
+  for (var complexSelector in candidates) {
+    var into = candidates[complexSelector];
+    if (!into[0].isComplex)
+      continue;
+
+    var intoPosition = into[into.length - 1].where;
+    var intoToken = tokens[intoPosition];
+    var reducedBodies = [];
+
+    var selectors = isMergeable(complexSelector, mergeablePseudoClasses, mergeablePseudoElements) ?
+      into[0].list :
+      [complexSelector];
+
+    localContext.intoPosition = intoPosition;
+    localContext.reducedBodies = reducedBodies;
+
+    for (var j = 0, m = selectors.length; j < m; j++) {
+      var selector = selectors[j];
+      var data = candidates[selector];
+
+      if (data.length < 2)
+        continue allSelectors;
+
+      localContext.data = data;
+
+      reduceSelector(tokens, data, {
+        filterOut: filterOut,
+        callback: collectReducedBodies
+      }, options, context);
+
+      if (serializeBody(reducedBodies[reducedBodies.length - 1]) != serializeBody(reducedBodies[0]))
+        continue allSelectors;
+    }
+
+    intoToken[2] = reducedBodies[0];
+  }
+}
+
+function reduceSelector(tokens, data, context, options, outerContext) {
+  var bodies = [];
+  var bodiesAsList = [];
+  var processedTokens = [];
+
+  for (var j = data.length - 1; j >= 0; j--) {
+    if (context.filterOut(j, bodies))
+      continue;
+
+    var where = data[j].where;
+    var token = tokens[where];
+    var clonedBody = cloneArray(token[2]);
+
+    bodies = bodies.concat(clonedBody);
+    bodiesAsList.push(clonedBody);
+    processedTokens.push(where);
+  }
+
+  optimizeProperties(bodies, true, false, outerContext);
+
+  var processedCount = processedTokens.length;
+  var propertyIdx = bodies.length - 1;
+  var tokenIdx = processedCount - 1;
+
+  while (tokenIdx >= 0) {
+     if ((tokenIdx === 0 || (bodies[propertyIdx] && bodiesAsList[tokenIdx].indexOf(bodies[propertyIdx]) > -1)) && propertyIdx > -1) {
+      propertyIdx--;
+      continue;
+    }
+
+    var newBody = bodies.splice(propertyIdx + 1);
+    context.callback(tokens[processedTokens[tokenIdx]], newBody, processedCount, tokenIdx);
+
+    tokenIdx--;
+  }
+}
+
+module.exports = reduceNonAdjacent;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js b/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js
new file mode 100644
index 000000000..bc85d5d67
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js
@@ -0,0 +1,30 @@
+var Token = require('../../tokenizer/token');
+
+var serializeAll = require('../../writer/one-time').all;
+
+var FONT_FACE_SCOPE = '@font-face';
+
+function removeDuplicateFontAtRules(tokens) {
+  var fontAtRules = [];
+  var token;
+  var key;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    if (token[0] != Token.AT_RULE_BLOCK && token[1][0][1] != FONT_FACE_SCOPE) {
+      continue;
+    }
+
+    key = serializeAll([token]);
+
+    if (fontAtRules.indexOf(key) > -1) {
+      token[2] = [];
+    } else {
+      fontAtRules.push(key);
+    }
+  }
+}
+
+module.exports = removeDuplicateFontAtRules;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-media-queries.js b/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-media-queries.js
new file mode 100644
index 000000000..2c8f31d9d
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-media-queries.js
@@ -0,0 +1,30 @@
+var Token = require('../../tokenizer/token');
+
+var serializeAll = require('../../writer/one-time').all;
+var serializeRules = require('../../writer/one-time').rules;
+
+function removeDuplicateMediaQueries(tokens) {
+  var candidates = {};
+  var candidate;
+  var token;
+  var key;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+    if (token[0] != Token.NESTED_BLOCK) {
+      continue;
+    }
+
+    key = serializeRules(token[1]) + '%' + serializeAll(token[2]);
+    candidate = candidates[key];
+
+    if (candidate) {
+      candidate[2] = [];
+    }
+
+    candidates[key] = token;
+  }
+}
+
+module.exports = removeDuplicateMediaQueries;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/remove-duplicates.js b/node_modules/clean-css/lib/optimizer/level-2/remove-duplicates.js
new file mode 100644
index 000000000..9aa6ace93
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/remove-duplicates.js
@@ -0,0 +1,43 @@
+var Token = require('../../tokenizer/token');
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+function removeDuplicates(tokens) {
+  var matched = {};
+  var moreThanOnce = [];
+  var id, token;
+  var body, bodies;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+    if (token[0] != Token.RULE)
+      continue;
+
+    id = serializeRules(token[1]);
+
+    if (matched[id] && matched[id].length == 1)
+      moreThanOnce.push(id);
+    else
+      matched[id] = matched[id] || [];
+
+    matched[id].push(i);
+  }
+
+  for (i = 0, l = moreThanOnce.length; i < l; i++) {
+    id = moreThanOnce[i];
+    bodies = [];
+
+    for (var j = matched[id].length - 1; j >= 0; j--) {
+      token = tokens[matched[id][j]];
+      body = serializeBody(token[2]);
+
+      if (bodies.indexOf(body) > -1)
+        token[2] = [];
+      else
+        bodies.push(body);
+    }
+  }
+}
+
+module.exports = removeDuplicates;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/reorderable.js b/node_modules/clean-css/lib/optimizer/level-2/reorderable.js
new file mode 100644
index 000000000..4a3747a08
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/reorderable.js
@@ -0,0 +1,93 @@
+// TODO: it'd be great to merge it with the other canReorder functionality
+
+var rulesOverlap = require('./rules-overlap');
+var specificitiesOverlap = require('./specificities-overlap');
+
+var FLEX_PROPERTIES = /align\-items|box\-align|box\-pack|flex|justify/;
+var BORDER_PROPERTIES = /^border\-(top|right|bottom|left|color|style|width|radius)/;
+
+function canReorder(left, right, cache) {
+  for (var i = right.length - 1; i >= 0; i--) {
+    for (var j = left.length - 1; j >= 0; j--) {
+      if (!canReorderSingle(left[j], right[i], cache))
+        return false;
+    }
+  }
+
+  return true;
+}
+
+function canReorderSingle(left, right, cache) {
+  var leftName = left[0];
+  var leftValue = left[1];
+  var leftNameRoot = left[2];
+  var leftSelector = left[5];
+  var leftInSpecificSelector = left[6];
+  var rightName = right[0];
+  var rightValue = right[1];
+  var rightNameRoot = right[2];
+  var rightSelector = right[5];
+  var rightInSpecificSelector = right[6];
+
+  if (leftName == 'font' && rightName == 'line-height' || rightName == 'font' && leftName == 'line-height')
+    return false;
+  if (FLEX_PROPERTIES.test(leftName) && FLEX_PROPERTIES.test(rightName))
+    return false;
+  if (leftNameRoot == rightNameRoot && unprefixed(leftName) == unprefixed(rightName) && (vendorPrefixed(leftName) ^ vendorPrefixed(rightName)))
+    return false;
+  if (leftNameRoot == 'border' && BORDER_PROPERTIES.test(rightNameRoot) && (leftName == 'border' || leftName == rightNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName))))
+    return false;
+  if (rightNameRoot == 'border' && BORDER_PROPERTIES.test(leftNameRoot) && (rightName == 'border' || rightName == leftNameRoot || (leftValue != rightValue && sameBorderComponent(leftName, rightName))))
+    return false;
+  if (leftNameRoot == 'border' && rightNameRoot == 'border' && leftName != rightName && (isSideBorder(leftName) && isStyleBorder(rightName) || isStyleBorder(leftName) && isSideBorder(rightName)))
+    return false;
+  if (leftNameRoot != rightNameRoot)
+    return true;
+  if (leftName == rightName && leftNameRoot == rightNameRoot && (leftValue == rightValue || withDifferentVendorPrefix(leftValue, rightValue)))
+    return true;
+  if (leftName != rightName && leftNameRoot == rightNameRoot && leftName != leftNameRoot && rightName != rightNameRoot)
+    return true;
+  if (leftName != rightName && leftNameRoot == rightNameRoot && leftValue == rightValue)
+    return true;
+  if (rightInSpecificSelector && leftInSpecificSelector && !inheritable(leftNameRoot) && !inheritable(rightNameRoot) && !rulesOverlap(rightSelector, leftSelector, false))
+    return true;
+  if (!specificitiesOverlap(leftSelector, rightSelector, cache))
+    return true;
+
+  return false;
+}
+
+function vendorPrefixed(name) {
+  return /^\-(?:moz|webkit|ms|o)\-/.test(name);
+}
+
+function unprefixed(name) {
+  return name.replace(/^\-(?:moz|webkit|ms|o)\-/, '');
+}
+
+function sameBorderComponent(name1, name2) {
+  return name1.split('-').pop() == name2.split('-').pop();
+}
+
+function isSideBorder(name) {
+  return name == 'border-top' || name == 'border-right' || name == 'border-bottom' || name == 'border-left';
+}
+
+function isStyleBorder(name) {
+  return name == 'border-color' || name == 'border-style' || name == 'border-width';
+}
+
+function withDifferentVendorPrefix(value1, value2) {
+  return vendorPrefixed(value1) && vendorPrefixed(value2) && value1.split('-')[1] != value2.split('-')[2];
+}
+
+function inheritable(name) {
+  // According to http://www.w3.org/TR/CSS21/propidx.html
+  // Others will be catched by other, preceeding rules
+  return name == 'font' || name == 'line-height' || name == 'list-style';
+}
+
+module.exports = {
+  canReorder: canReorder,
+  canReorderSingle: canReorderSingle
+};
diff --git a/node_modules/clean-css/lib/optimizer/level-2/restore-with-components.js b/node_modules/clean-css/lib/optimizer/level-2/restore-with-components.js
new file mode 100644
index 000000000..caf7c4c94
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/restore-with-components.js
@@ -0,0 +1,13 @@
+var compactable = require('./compactable');
+
+function restoreWithComponents(property) {
+  var descriptor = compactable[property.name];
+
+  if (descriptor && descriptor.shorthand) {
+    return descriptor.restore(property, compactable);
+  } else {
+    return property.value;
+  }
+}
+
+module.exports = restoreWithComponents;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/restore.js b/node_modules/clean-css/lib/optimizer/level-2/restore.js
new file mode 100644
index 000000000..149688c5b
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/restore.js
@@ -0,0 +1,233 @@
+var shallowClone = require('./clone').shallow;
+
+var Token = require('../../tokenizer/token');
+var Marker = require('../../tokenizer/marker');
+
+function isInheritOnly(values) {
+  for (var i = 0, l = values.length; i < l; i++) {
+    var value = values[i][1];
+
+    if (value != 'inherit' && value != Marker.COMMA && value != Marker.FORWARD_SLASH)
+      return false;
+  }
+
+  return true;
+}
+
+function background(property, compactable, lastInMultiplex) {
+  var components = property.components;
+  var restored = [];
+  var needsOne, needsBoth;
+
+  function restoreValue(component) {
+    Array.prototype.unshift.apply(restored, component.value);
+  }
+
+  function isDefaultValue(component) {
+    var descriptor = compactable[component.name];
+
+    if (descriptor.doubleValues && descriptor.defaultValue.length == 1) {
+      return component.value[0][1] == descriptor.defaultValue[0] && (component.value[1] ? component.value[1][1] == descriptor.defaultValue[0] : true);
+    } else if (descriptor.doubleValues && descriptor.defaultValue.length != 1) {
+      return component.value[0][1] == descriptor.defaultValue[0] && (component.value[1] ? component.value[1][1] : component.value[0][1]) == descriptor.defaultValue[1];
+    } else {
+      return component.value[0][1] == descriptor.defaultValue;
+    }
+  }
+
+  for (var i = components.length - 1; i >= 0; i--) {
+    var component = components[i];
+    var isDefault = isDefaultValue(component);
+
+    if (component.name == 'background-clip') {
+      var originComponent = components[i - 1];
+      var isOriginDefault = isDefaultValue(originComponent);
+
+      needsOne = component.value[0][1] == originComponent.value[0][1];
+
+      needsBoth = !needsOne && (
+        (isOriginDefault && !isDefault) ||
+        (!isOriginDefault && !isDefault) ||
+        (!isOriginDefault && isDefault && component.value[0][1] != originComponent.value[0][1]));
+
+      if (needsOne) {
+        restoreValue(originComponent);
+      } else if (needsBoth) {
+        restoreValue(component);
+        restoreValue(originComponent);
+      }
+
+      i--;
+    } else if (component.name == 'background-size') {
+      var positionComponent = components[i - 1];
+      var isPositionDefault = isDefaultValue(positionComponent);
+
+      needsOne = !isPositionDefault && isDefault;
+
+      needsBoth = !needsOne &&
+        (isPositionDefault && !isDefault || !isPositionDefault && !isDefault);
+
+      if (needsOne) {
+        restoreValue(positionComponent);
+      } else if (needsBoth) {
+        restoreValue(component);
+        restored.unshift([Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]);
+        restoreValue(positionComponent);
+      } else if (positionComponent.value.length == 1) {
+        restoreValue(positionComponent);
+      }
+
+      i--;
+    } else {
+      if (isDefault || compactable[component.name].multiplexLastOnly && !lastInMultiplex)
+        continue;
+
+      restoreValue(component);
+    }
+  }
+
+  if (restored.length === 0 && property.value.length == 1 && property.value[0][1] == '0')
+    restored.push(property.value[0]);
+
+  if (restored.length === 0)
+    restored.push([Token.PROPERTY_VALUE, compactable[property.name].defaultValue]);
+
+  if (isInheritOnly(restored))
+    return [restored[0]];
+
+  return restored;
+}
+
+function borderRadius(property, compactable) {
+  if (property.multiplex) {
+    var horizontal = shallowClone(property);
+    var vertical = shallowClone(property);
+
+    for (var i = 0; i < 4; i++) {
+      var component = property.components[i];
+
+      var horizontalComponent = shallowClone(property);
+      horizontalComponent.value = [component.value[0]];
+      horizontal.components.push(horizontalComponent);
+
+      var verticalComponent = shallowClone(property);
+      // FIXME: only shorthand compactor (see breakup#borderRadius) knows that border radius
+      // longhands have two values, whereas tokenizer does not care about populating 2nd value
+      // if it's missing, hence this fallback
+      verticalComponent.value = [component.value[1] || component.value[0]];
+      vertical.components.push(verticalComponent);
+    }
+
+    var horizontalValues = fourValues(horizontal, compactable);
+    var verticalValues = fourValues(vertical, compactable);
+
+    if (horizontalValues.length == verticalValues.length &&
+        horizontalValues[0][1] == verticalValues[0][1] &&
+        (horizontalValues.length > 1 ? horizontalValues[1][1] == verticalValues[1][1] : true) &&
+        (horizontalValues.length > 2 ? horizontalValues[2][1] == verticalValues[2][1] : true) &&
+        (horizontalValues.length > 3 ? horizontalValues[3][1] == verticalValues[3][1] : true)) {
+      return horizontalValues;
+    } else {
+      return horizontalValues.concat([[Token.PROPERTY_VALUE, Marker.FORWARD_SLASH]]).concat(verticalValues);
+    }
+  } else {
+    return fourValues(property, compactable);
+  }
+}
+
+function fourValues(property) {
+  var components = property.components;
+  var value1 = components[0].value[0];
+  var value2 = components[1].value[0];
+  var value3 = components[2].value[0];
+  var value4 = components[3].value[0];
+
+  if (value1[1] == value2[1] && value1[1] == value3[1] && value1[1] == value4[1]) {
+    return [value1];
+  } else if (value1[1] == value3[1] && value2[1] == value4[1]) {
+    return [value1, value2];
+  } else if (value2[1] == value4[1]) {
+    return [value1, value2, value3];
+  } else {
+    return [value1, value2, value3, value4];
+  }
+}
+
+function multiplex(restoreWith) {
+  return function (property, compactable) {
+    if (!property.multiplex)
+      return restoreWith(property, compactable, true);
+
+    var multiplexSize = 0;
+    var restored = [];
+    var componentMultiplexSoFar = {};
+    var i, l;
+
+    // At this point we don't know what's the multiplex size, e.g. how many background layers are there
+    for (i = 0, l = property.components[0].value.length; i < l; i++) {
+      if (property.components[0].value[i][1] == Marker.COMMA)
+        multiplexSize++;
+    }
+
+    for (i = 0; i <= multiplexSize; i++) {
+      var _property = shallowClone(property);
+
+      // We split multiplex into parts and restore them one by one
+      for (var j = 0, m = property.components.length; j < m; j++) {
+        var componentToClone = property.components[j];
+        var _component = shallowClone(componentToClone);
+        _property.components.push(_component);
+
+        // The trick is some properties has more than one value, so we iterate over values looking for
+        // a multiplex separator - a comma
+        for (var k = componentMultiplexSoFar[_component.name] || 0, n = componentToClone.value.length; k < n; k++) {
+          if (componentToClone.value[k][1] == Marker.COMMA) {
+            componentMultiplexSoFar[_component.name] = k + 1;
+            break;
+          }
+
+          _component.value.push(componentToClone.value[k]);
+        }
+      }
+
+      // No we can restore shorthand value
+      var lastInMultiplex = i == multiplexSize;
+      var _restored = restoreWith(_property, compactable, lastInMultiplex);
+      Array.prototype.push.apply(restored, _restored);
+
+      if (i < multiplexSize)
+        restored.push([Token.PROPERTY_VALUE, Marker.COMMA]);
+    }
+
+    return restored;
+  };
+}
+
+function withoutDefaults(property, compactable) {
+  var components = property.components;
+  var restored = [];
+
+  for (var i = components.length - 1; i >= 0; i--) {
+    var component = components[i];
+    var descriptor = compactable[component.name];
+
+    if (component.value[0][1] != descriptor.defaultValue)
+      restored.unshift(component.value[0]);
+  }
+
+  if (restored.length === 0)
+    restored.push([Token.PROPERTY_VALUE, compactable[property.name].defaultValue]);
+
+  if (isInheritOnly(restored))
+    return [restored[0]];
+
+  return restored;
+}
+
+module.exports = {
+  background: background,
+  borderRadius: borderRadius,
+  fourValues: fourValues,
+  multiplex: multiplex,
+  withoutDefaults: withoutDefaults
+};
diff --git a/node_modules/clean-css/lib/optimizer/level-2/restructure.js b/node_modules/clean-css/lib/optimizer/level-2/restructure.js
new file mode 100644
index 000000000..2635415ae
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/restructure.js
@@ -0,0 +1,388 @@
+var canReorderSingle = require('./reorderable').canReorderSingle;
+var extractProperties = require('./extract-properties');
+var isMergeable = require('./is-mergeable');
+var tidyRuleDuplicates = require('./tidy-rule-duplicates');
+
+var Token = require('../../tokenizer/token');
+
+var cloneArray = require('../../utils/clone-array');
+
+var serializeBody = require('../../writer/one-time').body;
+var serializeRules = require('../../writer/one-time').rules;
+
+function naturalSorter(a, b) {
+  return a > b ? 1 : -1;
+}
+
+function cloneAndMergeSelectors(propertyA, propertyB) {
+  var cloned = cloneArray(propertyA);
+  cloned[5] = cloned[5].concat(propertyB[5]);
+
+  return cloned;
+}
+
+function restructure(tokens, context) {
+  var options = context.options;
+  var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
+  var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
+  var mergeLimit = 8191;
+  var specificityCache = context.cache.specificity;
+  var movableTokens = {};
+  var movedProperties = [];
+  var multiPropertyMoveCache = {};
+  var movedToBeDropped = [];
+  var maxCombinationsLevel = 2;
+  var ID_JOIN_CHARACTER = '%';
+
+  function sendToMultiPropertyMoveCache(position, movedProperty, allFits) {
+    for (var i = allFits.length - 1; i >= 0; i--) {
+      var fit = allFits[i][0];
+      var id = addToCache(movedProperty, fit);
+
+      if (multiPropertyMoveCache[id].length > 1 && processMultiPropertyMove(position, multiPropertyMoveCache[id])) {
+        removeAllMatchingFromCache(id);
+        break;
+      }
+    }
+  }
+
+  function addToCache(movedProperty, fit) {
+    var id = cacheId(fit);
+    multiPropertyMoveCache[id] = multiPropertyMoveCache[id] || [];
+    multiPropertyMoveCache[id].push([movedProperty, fit]);
+    return id;
+  }
+
+  function removeAllMatchingFromCache(matchId) {
+    var matchSelectors = matchId.split(ID_JOIN_CHARACTER);
+    var forRemoval = [];
+    var i;
+
+    for (var id in multiPropertyMoveCache) {
+      var selectors = id.split(ID_JOIN_CHARACTER);
+      for (i = selectors.length - 1; i >= 0; i--) {
+        if (matchSelectors.indexOf(selectors[i]) > -1) {
+          forRemoval.push(id);
+          break;
+        }
+      }
+    }
+
+    for (i = forRemoval.length - 1; i >= 0; i--) {
+      delete multiPropertyMoveCache[forRemoval[i]];
+    }
+  }
+
+  function cacheId(cachedTokens) {
+    var id = [];
+    for (var i = 0, l = cachedTokens.length; i < l; i++) {
+      id.push(serializeRules(cachedTokens[i][1]));
+    }
+    return id.join(ID_JOIN_CHARACTER);
+  }
+
+  function tokensToMerge(sourceTokens) {
+    var uniqueTokensWithBody = [];
+    var mergeableTokens = [];
+
+    for (var i = sourceTokens.length - 1; i >= 0; i--) {
+      if (!isMergeable(serializeRules(sourceTokens[i][1]), mergeablePseudoClasses, mergeablePseudoElements)) {
+        continue;
+      }
+
+      mergeableTokens.unshift(sourceTokens[i]);
+      if (sourceTokens[i][2].length > 0 && uniqueTokensWithBody.indexOf(sourceTokens[i]) == -1)
+        uniqueTokensWithBody.push(sourceTokens[i]);
+    }
+
+    return uniqueTokensWithBody.length > 1 ?
+      mergeableTokens :
+      [];
+  }
+
+  function shortenIfPossible(position, movedProperty) {
+    var name = movedProperty[0];
+    var value = movedProperty[1];
+    var key = movedProperty[4];
+    var valueSize = name.length + value.length + 1;
+    var allSelectors = [];
+    var qualifiedTokens = [];
+
+    var mergeableTokens = tokensToMerge(movableTokens[key]);
+    if (mergeableTokens.length < 2)
+      return;
+
+    var allFits = findAllFits(mergeableTokens, valueSize, 1);
+    var bestFit = allFits[0];
+    if (bestFit[1] > 0)
+      return sendToMultiPropertyMoveCache(position, movedProperty, allFits);
+
+    for (var i = bestFit[0].length - 1; i >=0; i--) {
+      allSelectors = bestFit[0][i][1].concat(allSelectors);
+      qualifiedTokens.unshift(bestFit[0][i]);
+    }
+
+    allSelectors = tidyRuleDuplicates(allSelectors);
+    dropAsNewTokenAt(position, [movedProperty], allSelectors, qualifiedTokens);
+  }
+
+  function fitSorter(fit1, fit2) {
+    return fit1[1] > fit2[1] ? 1 : (fit1[1] == fit2[1] ? 0 : -1);
+  }
+
+  function findAllFits(mergeableTokens, propertySize, propertiesCount) {
+    var combinations = allCombinations(mergeableTokens, propertySize, propertiesCount, maxCombinationsLevel - 1);
+    return combinations.sort(fitSorter);
+  }
+
+  function allCombinations(tokensVariant, propertySize, propertiesCount, level) {
+    var differenceVariants = [[tokensVariant, sizeDifference(tokensVariant, propertySize, propertiesCount)]];
+    if (tokensVariant.length > 2 && level > 0) {
+      for (var i = tokensVariant.length - 1; i >= 0; i--) {
+        var subVariant = Array.prototype.slice.call(tokensVariant, 0);
+        subVariant.splice(i, 1);
+        differenceVariants = differenceVariants.concat(allCombinations(subVariant, propertySize, propertiesCount, level - 1));
+      }
+    }
+
+    return differenceVariants;
+  }
+
+  function sizeDifference(tokensVariant, propertySize, propertiesCount) {
+    var allSelectorsSize = 0;
+    for (var i = tokensVariant.length - 1; i >= 0; i--) {
+      allSelectorsSize += tokensVariant[i][2].length > propertiesCount ? serializeRules(tokensVariant[i][1]).length : -1;
+    }
+    return allSelectorsSize - (tokensVariant.length - 1) * propertySize + 1;
+  }
+
+  function dropAsNewTokenAt(position, properties, allSelectors, mergeableTokens) {
+    var i, j, k, m;
+    var allProperties = [];
+
+    for (i = mergeableTokens.length - 1; i >= 0; i--) {
+      var mergeableToken = mergeableTokens[i];
+
+      for (j = mergeableToken[2].length - 1; j >= 0; j--) {
+        var mergeableProperty = mergeableToken[2][j];
+
+        for (k = 0, m = properties.length; k < m; k++) {
+          var property = properties[k];
+
+          var mergeablePropertyName = mergeableProperty[1][1];
+          var propertyName = property[0];
+          var propertyBody = property[4];
+          if (mergeablePropertyName == propertyName && serializeBody([mergeableProperty]) == propertyBody) {
+            mergeableToken[2].splice(j, 1);
+            break;
+          }
+        }
+      }
+    }
+
+    for (i = properties.length - 1; i >= 0; i--) {
+      allProperties.unshift(properties[i][3]);
+    }
+
+    var newToken = [Token.RULE, allSelectors, allProperties];
+    tokens.splice(position, 0, newToken);
+  }
+
+  function dropPropertiesAt(position, movedProperty) {
+    var key = movedProperty[4];
+    var toMove = movableTokens[key];
+
+    if (toMove && toMove.length > 1) {
+      if (!shortenMultiMovesIfPossible(position, movedProperty))
+        shortenIfPossible(position, movedProperty);
+    }
+  }
+
+  function shortenMultiMovesIfPossible(position, movedProperty) {
+    var candidates = [];
+    var propertiesAndMergableTokens = [];
+    var key = movedProperty[4];
+    var j, k;
+
+    var mergeableTokens = tokensToMerge(movableTokens[key]);
+    if (mergeableTokens.length < 2)
+      return;
+
+    movableLoop:
+    for (var value in movableTokens) {
+      var tokensList = movableTokens[value];
+
+      for (j = mergeableTokens.length - 1; j >= 0; j--) {
+        if (tokensList.indexOf(mergeableTokens[j]) == -1)
+          continue movableLoop;
+      }
+
+      candidates.push(value);
+    }
+
+    if (candidates.length < 2)
+      return false;
+
+    for (j = candidates.length - 1; j >= 0; j--) {
+      for (k = movedProperties.length - 1; k >= 0; k--) {
+        if (movedProperties[k][4] == candidates[j]) {
+          propertiesAndMergableTokens.unshift([movedProperties[k], mergeableTokens]);
+          break;
+        }
+      }
+    }
+
+    return processMultiPropertyMove(position, propertiesAndMergableTokens);
+  }
+
+  function processMultiPropertyMove(position, propertiesAndMergableTokens) {
+    var valueSize = 0;
+    var properties = [];
+    var property;
+
+    for (var i = propertiesAndMergableTokens.length - 1; i >= 0; i--) {
+      property = propertiesAndMergableTokens[i][0];
+      var fullValue = property[4];
+      valueSize += fullValue.length + (i > 0 ? 1 : 0);
+
+      properties.push(property);
+    }
+
+    var mergeableTokens = propertiesAndMergableTokens[0][1];
+    var bestFit = findAllFits(mergeableTokens, valueSize, properties.length)[0];
+    if (bestFit[1] > 0)
+      return false;
+
+    var allSelectors = [];
+    var qualifiedTokens = [];
+    for (i = bestFit[0].length - 1; i >= 0; i--) {
+      allSelectors = bestFit[0][i][1].concat(allSelectors);
+      qualifiedTokens.unshift(bestFit[0][i]);
+    }
+
+    allSelectors = tidyRuleDuplicates(allSelectors);
+    dropAsNewTokenAt(position, properties, allSelectors, qualifiedTokens);
+
+    for (i = properties.length - 1; i >= 0; i--) {
+      property = properties[i];
+      var index = movedProperties.indexOf(property);
+
+      delete movableTokens[property[4]];
+
+      if (index > -1 && movedToBeDropped.indexOf(index) == -1)
+        movedToBeDropped.push(index);
+    }
+
+    return true;
+  }
+
+  function boundToAnotherPropertyInCurrrentToken(property, movedProperty, token) {
+    var propertyName = property[0];
+    var movedPropertyName = movedProperty[0];
+    if (propertyName != movedPropertyName)
+      return false;
+
+    var key = movedProperty[4];
+    var toMove = movableTokens[key];
+    return toMove && toMove.indexOf(token) > -1;
+  }
+
+  for (var i = tokens.length - 1; i >= 0; i--) {
+    var token = tokens[i];
+    var isRule;
+    var j, k, m;
+    var samePropertyAt;
+
+    if (token[0] == Token.RULE) {
+      isRule = true;
+    } else if (token[0] == Token.NESTED_BLOCK) {
+      isRule = false;
+    } else {
+      continue;
+    }
+
+    // We cache movedProperties.length as it may change in the loop
+    var movedCount = movedProperties.length;
+
+    var properties = extractProperties(token);
+    movedToBeDropped = [];
+
+    var unmovableInCurrentToken = [];
+    for (j = properties.length - 1; j >= 0; j--) {
+      for (k = j - 1; k >= 0; k--) {
+        if (!canReorderSingle(properties[j], properties[k], specificityCache)) {
+          unmovableInCurrentToken.push(j);
+          break;
+        }
+      }
+    }
+
+    for (j = properties.length - 1; j >= 0; j--) {
+      var property = properties[j];
+      var movedSameProperty = false;
+
+      for (k = 0; k < movedCount; k++) {
+        var movedProperty = movedProperties[k];
+
+        if (movedToBeDropped.indexOf(k) == -1 && (!canReorderSingle(property, movedProperty, specificityCache) && !boundToAnotherPropertyInCurrrentToken(property, movedProperty, token) ||
+            movableTokens[movedProperty[4]] && movableTokens[movedProperty[4]].length === mergeLimit)) {
+          dropPropertiesAt(i + 1, movedProperty, token);
+
+          if (movedToBeDropped.indexOf(k) == -1) {
+            movedToBeDropped.push(k);
+            delete movableTokens[movedProperty[4]];
+          }
+        }
+
+        if (!movedSameProperty) {
+          movedSameProperty = property[0] == movedProperty[0] && property[1] == movedProperty[1];
+
+          if (movedSameProperty) {
+            samePropertyAt = k;
+          }
+        }
+      }
+
+      if (!isRule || unmovableInCurrentToken.indexOf(j) > -1)
+        continue;
+
+      var key = property[4];
+
+      if (movedSameProperty && movedProperties[samePropertyAt][5].length + property[5].length > mergeLimit) {
+        dropPropertiesAt(i + 1, movedProperties[samePropertyAt]);
+        movedProperties.splice(samePropertyAt, 1);
+        movableTokens[key] = [token];
+        movedSameProperty = false;
+      } else {
+        movableTokens[key] = movableTokens[key] || [];
+        movableTokens[key].push(token);
+      }
+
+      if (movedSameProperty) {
+        movedProperties[samePropertyAt] = cloneAndMergeSelectors(movedProperties[samePropertyAt], property);
+      } else {
+        movedProperties.push(property);
+      }
+    }
+
+    movedToBeDropped = movedToBeDropped.sort(naturalSorter);
+    for (j = 0, m = movedToBeDropped.length; j < m; j++) {
+      var dropAt = movedToBeDropped[j] - j;
+      movedProperties.splice(dropAt, 1);
+    }
+  }
+
+  var position = tokens[0] && tokens[0][0] == Token.AT_RULE && tokens[0][1].indexOf('@charset') === 0 ? 1 : 0;
+  for (; position < tokens.length - 1; position++) {
+    var isImportRule = tokens[position][0] === Token.AT_RULE && tokens[position][1].indexOf('@import') === 0;
+    var isComment = tokens[position][0] === Token.COMMENT;
+    if (!(isImportRule || isComment))
+      break;
+  }
+
+  for (i = 0; i < movedProperties.length; i++) {
+    dropPropertiesAt(position, movedProperties[i]);
+  }
+}
+
+module.exports = restructure;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js b/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js
new file mode 100644
index 000000000..811a517b2
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js
@@ -0,0 +1,32 @@
+var MODIFIER_PATTERN = /\-\-.+$/;
+
+function rulesOverlap(rule1, rule2, bemMode) {
+  var scope1;
+  var scope2;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = rule1.length; i < l; i++) {
+    scope1 = rule1[i][1];
+
+    for (j = 0, m = rule2.length; j < m; j++) {
+      scope2 = rule2[j][1];
+
+      if (scope1 == scope2) {
+        return true;
+      }
+
+      if (bemMode && withoutModifiers(scope1) == withoutModifiers(scope2)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function withoutModifiers(scope) {
+  return scope.replace(MODIFIER_PATTERN, '');
+}
+
+module.exports = rulesOverlap;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/specificities-overlap.js b/node_modules/clean-css/lib/optimizer/level-2/specificities-overlap.js
new file mode 100644
index 000000000..bde037446
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/specificities-overlap.js
@@ -0,0 +1,34 @@
+var specificity = require('./specificity');
+
+function specificitiesOverlap(selector1, selector2, cache) {
+  var specificity1;
+  var specificity2;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = selector1.length; i < l; i++) {
+    specificity1 = findSpecificity(selector1[i][1], cache);
+
+    for (j = 0, m = selector2.length; j < m; j++) {
+      specificity2 = findSpecificity(selector2[j][1], cache);
+
+      if (specificity1[0] === specificity2[0] && specificity1[1] === specificity2[1] && specificity1[2] === specificity2[2]) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function findSpecificity(selector, cache) {
+  var value;
+
+  if (!(selector in cache)) {
+    cache[selector] = value = specificity(selector);
+  }
+
+  return value || cache[selector];
+}
+
+module.exports = specificitiesOverlap;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/specificity.js b/node_modules/clean-css/lib/optimizer/level-2/specificity.js
new file mode 100644
index 000000000..bbd224f15
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/specificity.js
@@ -0,0 +1,77 @@
+var Marker = require('../../tokenizer/marker');
+
+var Selector = {
+  ADJACENT_SIBLING: '+',
+  DESCENDANT: '>',
+  DOT: '.',
+  HASH: '#',
+  NON_ADJACENT_SIBLING: '~',
+  PSEUDO: ':'
+};
+
+var LETTER_PATTERN = /[a-zA-Z]/;
+var NOT_PREFIX = ':not(';
+var SEPARATOR_PATTERN = /[\s,\(>~\+]/;
+
+function specificity(selector) {
+  var result = [0, 0, 0];
+  var character;
+  var isEscaped;
+  var isSingleQuoted;
+  var isDoubleQuoted;
+  var roundBracketLevel = 0;
+  var couldIntroduceNewTypeSelector;
+  var withinNotPseudoClass = false;
+  var wasPseudoClass = false;
+  var i, l;
+
+  for (i = 0, l = selector.length; i < l; i++) {
+    character = selector[i];
+
+    if (isEscaped) {
+      // noop
+    } else if (character == Marker.SINGLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
+      isSingleQuoted = true;
+    } else if (character == Marker.SINGLE_QUOTE && !isDoubleQuoted && isSingleQuoted) {
+      isSingleQuoted = false;
+    } else if (character == Marker.DOUBLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
+      isDoubleQuoted = true;
+    } else if (character == Marker.DOUBLE_QUOTE && isDoubleQuoted && !isSingleQuoted) {
+      isDoubleQuoted = false;
+    } else if (isSingleQuoted || isDoubleQuoted) {
+      continue;
+    } else if (roundBracketLevel > 0 && !withinNotPseudoClass) {
+      // noop
+    } else if (character == Marker.OPEN_ROUND_BRACKET) {
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && roundBracketLevel == 1) {
+      roundBracketLevel--;
+      withinNotPseudoClass = false;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET) {
+      roundBracketLevel--;
+    } else if (character == Selector.HASH) {
+      result[0]++;
+    } else if (character == Selector.DOT || character == Marker.OPEN_SQUARE_BRACKET) {
+      result[1]++;
+    } else if (character == Selector.PSEUDO && !wasPseudoClass && !isNotPseudoClass(selector, i)) {
+      result[1]++;
+      withinNotPseudoClass = false;
+    } else if (character == Selector.PSEUDO) {
+      withinNotPseudoClass = true;
+    } else if ((i === 0 || couldIntroduceNewTypeSelector) && LETTER_PATTERN.test(character)) {
+      result[2]++;
+    }
+
+    isEscaped = character == Marker.BACK_SLASH;
+    wasPseudoClass = character == Selector.PSEUDO;
+    couldIntroduceNewTypeSelector = !isEscaped && SEPARATOR_PATTERN.test(character);
+  }
+
+  return result;
+}
+
+function isNotPseudoClass(selector, index) {
+  return selector.indexOf(NOT_PREFIX, index) === index;
+}
+
+module.exports = specificity;
diff --git a/node_modules/clean-css/lib/optimizer/level-2/tidy-rule-duplicates.js b/node_modules/clean-css/lib/optimizer/level-2/tidy-rule-duplicates.js
new file mode 100644
index 000000000..30a9c2177
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/tidy-rule-duplicates.js
@@ -0,0 +1,21 @@
+function ruleSorter(s1, s2) {
+  return s1[1] > s2[1] ? 1 : -1;
+}
+
+function tidyRuleDuplicates(rules) {
+  var list = [];
+  var repeated = [];
+
+  for (var i = 0, l = rules.length; i < l; i++) {
+    var rule = rules[i];
+
+    if (repeated.indexOf(rule[1]) == -1) {
+      repeated.push(rule[1]);
+      list.push(rule);
+    }
+  }
+
+  return list.sort(ruleSorter);
+}
+
+module.exports = tidyRuleDuplicates;
diff --git a/node_modules/clean-css/lib/optimizer/remove-unused.js b/node_modules/clean-css/lib/optimizer/remove-unused.js
new file mode 100644
index 000000000..7b90c4079
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/remove-unused.js
@@ -0,0 +1,11 @@
+function removeUnused(properties) {
+  for (var i = properties.length - 1; i >= 0; i--) {
+    var property = properties[i];
+
+    if (property.unused) {
+      property.all.splice(property.position, 1);
+    }
+  }
+}
+
+module.exports = removeUnused;
diff --git a/node_modules/clean-css/lib/optimizer/restore-from-optimizing.js b/node_modules/clean-css/lib/optimizer/restore-from-optimizing.js
new file mode 100644
index 000000000..ebd69c2ac
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/restore-from-optimizing.js
@@ -0,0 +1,69 @@
+var Hack = require('./hack');
+
+var Marker = require('../tokenizer/marker');
+
+var ASTERISK_HACK = '*';
+var BACKSLASH_HACK = '\\';
+var IMPORTANT_TOKEN = '!important';
+var UNDERSCORE_HACK = '_';
+var BANG_HACK = '!ie';
+
+function restoreFromOptimizing(properties, restoreCallback) {
+  var property;
+  var restored;
+  var current;
+  var i;
+
+  for (i = properties.length - 1; i >= 0; i--) {
+    property = properties[i];
+
+    if (property.unused) {
+      continue;
+    }
+
+    if (!property.dirty && !property.important && !property.hack) {
+      continue;
+    }
+
+    if (restoreCallback) {
+      restored = restoreCallback(property);
+      property.value = restored;
+    } else {
+      restored = property.value;
+    }
+
+    if (property.important) {
+      restoreImportant(property);
+    }
+
+    if (property.hack) {
+      restoreHack(property);
+    }
+
+    if ('all' in property) {
+      current = property.all[property.position];
+      current[1][1] = property.name;
+
+      current.splice(2, current.length - 1);
+      Array.prototype.push.apply(current, restored);
+    }
+  }
+}
+
+function restoreImportant(property) {
+  property.value[property.value.length - 1][1] += IMPORTANT_TOKEN;
+}
+
+function restoreHack(property) {
+  if (property.hack[0] == Hack.UNDERSCORE) {
+    property.name = UNDERSCORE_HACK + property.name;
+  } else if (property.hack[0] == Hack.ASTERISK) {
+    property.name = ASTERISK_HACK + property.name;
+  } else if (property.hack[0] == Hack.BACKSLASH) {
+    property.value[property.value.length - 1][1] += BACKSLASH_HACK + property.hack[1];
+  } else if (property.hack[0] == Hack.BANG) {
+    property.value[property.value.length - 1][1] += Marker.SPACE + BANG_HACK;
+  }
+}
+
+module.exports = restoreFromOptimizing;
diff --git a/node_modules/clean-css/lib/optimizer/validator.js b/node_modules/clean-css/lib/optimizer/validator.js
new file mode 100644
index 000000000..35f041ea9
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/validator.js
@@ -0,0 +1,470 @@
+var Units = [
+  '%',
+  'ch',
+  'cm',
+  'em',
+  'ex',
+  'in',
+  'mm',
+  'pc',
+  'pt',
+  'px',
+  'rem',
+  'vh',
+  'vm',
+  'vmax',
+  'vmin',
+  'vw'
+];
+var cssUnitRegexStr = '(\\-?\\.?\\d+\\.?\\d*(' + Units.join('|') + '|)|auto|inherit)';
+var cssCalcRegexStr = '(\\-moz\\-|\\-webkit\\-)?calc\\([^\\)]+\\)';
+var cssFunctionNoVendorRegexStr = '[A-Z]+(\\-|[A-Z]|[0-9])+\\(.*?\\)';
+var cssFunctionVendorRegexStr = '\\-(\\-|[A-Z]|[0-9])+\\(.*?\\)';
+var cssVariableRegexStr = 'var\\(\\-\\-[^\\)]+\\)';
+var cssFunctionAnyRegexStr = '(' + cssVariableRegexStr + '|' + cssFunctionNoVendorRegexStr + '|' + cssFunctionVendorRegexStr + ')';
+var cssUnitOrCalcRegexStr = '(' + cssUnitRegexStr + '|' + cssCalcRegexStr + ')';
+
+var cssFunctionNoVendorRegex = new RegExp('^' + cssFunctionNoVendorRegexStr + '$', 'i');
+var cssVariableRegex = new RegExp('^' + cssVariableRegexStr + '$', 'i');
+var cssFunctionAnyRegex = new RegExp('^' + cssFunctionAnyRegexStr + '$', 'i');
+var cssUnitRegex = new RegExp('^' + cssUnitRegexStr + '$', 'i');
+var cssUnitOrCalcRegex = new RegExp('^' + cssUnitOrCalcRegexStr + '$', 'i');
+
+var urlRegex = /^url\([\s\S]+\)$/i;
+
+var globalKeywords = [
+  'inherit',
+  'initial',
+  'unset'
+];
+
+var Keywords = {
+  '*-style': [
+    'auto',
+    'dashed',
+    'dotted',
+    'double',
+    'groove',
+    'hidden',
+    'inset',
+    'none',
+    'outset',
+    'ridge',
+    'solid'
+  ],
+  'background-attachment': [
+    'fixed',
+    'inherit',
+    'local',
+    'scroll'
+  ],
+  'background-clip': [
+    'border-box',
+    'content-box',
+    'inherit',
+    'padding-box',
+    'text'
+  ],
+  'background-origin': [
+    'border-box',
+    'content-box',
+    'inherit',
+    'padding-box'
+  ],
+  'background-position': [
+    'bottom',
+    'center',
+    'left',
+    'right',
+    'top'
+  ],
+  'background-repeat': [
+    'no-repeat',
+    'inherit',
+    'repeat',
+    'repeat-x',
+    'repeat-y',
+    'round',
+    'space'
+  ],
+  'background-size': [
+    'auto',
+    'cover',
+    'contain'
+  ],
+  'border-collapse': [
+    'collapse',
+    'inherit',
+    'separate'
+  ],
+  'bottom': [
+    'auto'
+  ],
+  'clear': [
+    'both',
+    'left',
+    'none',
+    'right'
+  ],
+  'cursor': [
+    'all-scroll',
+    'auto',
+    'col-resize',
+    'crosshair',
+    'default',
+    'e-resize',
+    'help',
+    'move',
+    'n-resize',
+    'ne-resize',
+    'no-drop',
+    'not-allowed',
+    'nw-resize',
+    'pointer',
+    'progress',
+    'row-resize',
+    's-resize',
+    'se-resize',
+    'sw-resize',
+    'text',
+    'vertical-text',
+    'w-resize',
+    'wait'
+  ],
+  'display': [
+    'block',
+    'inline',
+    'inline-block',
+    'inline-table',
+    'list-item',
+    'none',
+    'table',
+    'table-caption',
+    'table-cell',
+    'table-column',
+    'table-column-group',
+    'table-footer-group',
+    'table-header-group',
+    'table-row',
+    'table-row-group'
+  ],
+  'float': [
+    'left',
+    'none',
+    'right'
+  ],
+  'left': [
+    'auto'
+  ],
+  'font-style': [
+    'italic',
+    'normal',
+    'oblique'
+  ],
+  'font-weight': [
+    '100',
+    '200',
+    '300',
+    '400',
+    '500',
+    '600',
+    '700',
+    '800',
+    '900',
+    'bold',
+    'bolder',
+    'lighter',
+    'normal'
+  ],
+  'list-style-position': [
+    'inside',
+    'outside'
+  ],
+  'list-style-type': [
+    'armenian',
+    'circle',
+    'decimal',
+    'decimal-leading-zero',
+    'disc',
+    'decimal|disc', // this is the default value of list-style-type, see comment in compactable.js
+    'georgian',
+    'lower-alpha',
+    'lower-greek',
+    'lower-latin',
+    'lower-roman',
+    'none',
+    'square',
+    'upper-alpha',
+    'upper-latin',
+    'upper-roman'
+  ],
+  'overflow': [
+    'auto',
+    'hidden',
+    'scroll',
+    'visible'
+  ],
+  'position': [
+    'absolute',
+    'fixed',
+    'relative',
+    'static'
+  ],
+  'right': [
+    'auto'
+  ],
+  'text-align': [
+    'center',
+    'justify',
+    'left',
+    'left|right', // this is the default value of list-style-type, see comment in compactable.js
+    'right'
+  ],
+  'text-decoration': [
+    'line-through',
+    'none',
+    'overline',
+    'underline'
+  ],
+  'text-overflow': [
+    'clip',
+    'ellipsis'
+  ],
+  'top': [
+    'auto'
+  ],
+  'vertical-align': [
+    'baseline',
+    'bottom',
+    'middle',
+    'sub',
+    'super',
+    'text-bottom',
+    'text-top',
+    'top'
+  ],
+  'visibility': [
+    'collapse',
+    'hidden',
+    'visible'
+  ],
+  'white-space': [
+    'normal',
+    'nowrap',
+    'pre'
+  ],
+  'width': [
+    'inherit',
+    'initial',
+    'medium',
+    'thick',
+    'thin'
+  ]
+};
+
+var VENDOR_PREFIX_PATTERN = /(^|\W)-\w+\-/;
+
+function areSameFunction(value1, value2) {
+  if (!isValidFunction(value1) || !isValidFunction(value2)) {
+    return false;
+  }
+
+  var function1Name = value1.substring(0, value1.indexOf('('));
+  var function2Name = value2.substring(0, value2.indexOf('('));
+
+  return function1Name === function2Name;
+}
+
+function hasNoVendorPrefix(value) {
+  return VENDOR_PREFIX_PATTERN.test(value);
+}
+
+function isValidBackgroundAttachment(value) {
+  return Keywords['background-attachment'].indexOf(value) > -1;
+}
+
+function isValidBackgroundClip(value) {
+  return Keywords['background-clip'].indexOf(value) > -1;
+}
+
+function isValidBackgroundRepeat(value) {
+  return Keywords['background-repeat'].indexOf(value) > -1;
+}
+
+function isValidBackgroundOrigin(value) {
+  return Keywords['background-origin'].indexOf(value) > -1;
+}
+
+function isValidBackgroundPosition(value) {
+  var parts;
+  var i, l;
+
+  if (value === 'inherit') {
+    return true;
+  }
+
+  parts = value.split(' ');
+  for (i = 0, l = parts.length; i < l; i++) {
+    if (parts[i] === '') {
+      continue;
+    } else if (isValidBackgroundPositionPart(parts[i])) {
+      continue;
+    }
+
+    return false;
+  }
+
+  return true;
+}
+
+function isValidBackgroundPositionPart(value) {
+  return Keywords['background-position'].indexOf(value) > -1 || cssUnitOrCalcRegex.test(value);
+}
+
+function isValidBackgroundSizePart(value) {
+  return Keywords['background-size'].indexOf(value) > -1 || cssUnitRegex.test(value);
+}
+
+function isValidColor(value) {
+  return isValidNamedColor(value) ||
+    isValidColorValue(value);
+}
+
+function isValidColorValue(value) {
+  return isValidHexColor(value) ||
+    isValidRgbaColor(value) ||
+    isValidHslaColor(value);
+}
+
+function isValidFunction(value) {
+  return !urlRegex.test(value) && cssFunctionAnyRegex.test(value);
+}
+
+function isValidFunctionWithoutVendorPrefix(value) {
+  return !urlRegex.test(value) && cssFunctionNoVendorRegex.test(value);
+}
+
+function isValidGlobalValue(value) {
+  return globalKeywords.indexOf(value) > -1;
+}
+
+function isValidHexColor(value) {
+  return (value.length === 4 || value.length === 7) && value[0] === '#';
+}
+
+function isValidHslaColor(value) {
+  return value.length > 0 && value.indexOf('hsla(') === 0 && value.indexOf(')') === value.length - 1;
+}
+
+function isValidImage(value) {
+  return value == 'none' || value == 'inherit' || isValidUrl(value);
+}
+
+function isValidKeywordValue(propertyName, value, includeGlobal) {
+  return Keywords[propertyName].indexOf(value) > -1 || includeGlobal && isValidGlobalValue(value);
+}
+
+function isValidListStyleType(value) {
+  return Keywords['list-style-type'].indexOf(value) > -1;
+}
+
+function isValidListStylePosition(value) {
+  return Keywords['list-style-position'].indexOf(value) > -1;
+}
+
+function isValidNamedColor(value) {
+  // We don't really check if it's a valid color value, but allow any letters in it
+  return value !== 'auto' && (value === 'transparent' || value === 'inherit' || /^[a-zA-Z]+$/.test(value));
+}
+
+function isValidRgbaColor(value) {
+  return value.length > 0 && value.indexOf('rgba(') === 0 && value.indexOf(')') === value.length - 1;
+}
+
+function isValidStyle(value) {
+  return Keywords['*-style'].indexOf(value) > -1;
+}
+
+function isValidTextShadow(compatibleCssUnitRegex, value) {
+  return isValidUnitWithoutFunction(compatibleCssUnitRegex, value) ||
+    isValidColor(value) ||
+    isValidGlobalValue(value);
+}
+
+function isValidUnit(compatibleCssUnitAnyRegex, value) {
+  return compatibleCssUnitAnyRegex.test(value);
+}
+
+function isValidUnitWithoutFunction(compatibleCssUnitRegex, value) {
+  return compatibleCssUnitRegex.test(value);
+}
+
+function isValidUrl(value) {
+  return urlRegex.test(value);
+}
+
+function isValidVariable(value) {
+  return cssVariableRegex.test(value);
+}
+
+function isValidVendorPrefixedValue(value) {
+  return /^-([A-Za-z0-9]|-)*$/gi.test(value);
+}
+
+function isValidWidth(compatibleCssUnitRegex, value) {
+  return isValidUnit(compatibleCssUnitRegex, value) || Keywords.width.indexOf(value) > -1;
+}
+
+function isValidZIndex(value) {
+  return value == 'auto' ||
+    isValidGlobalValue(value) ||
+    value.length > 0 && value == ('' + parseInt(value));
+}
+
+function validator(compatibility) {
+  var validUnits = Units.slice(0).filter(function (value) {
+    return !(value in compatibility.units) || compatibility.units[value] === true;
+  });
+
+  var compatibleCssUnitRegexStr = '(\\-?\\.?\\d+\\.?\\d*(' + validUnits.join('|') + '|)|auto|inherit)';
+  var compatibleCssUnitRegex = new RegExp('^' + compatibleCssUnitRegexStr + '$', 'i');
+  var compatibleCssUnitAnyRegex = new RegExp('^(none|' + Keywords.width.join('|') + '|' + compatibleCssUnitRegexStr + '|' + cssVariableRegexStr + '|' + cssFunctionNoVendorRegexStr + '|' + cssFunctionVendorRegexStr + ')$', 'i');
+  var colorOpacity = compatibility.colors.opacity;
+
+  return {
+    areSameFunction: areSameFunction,
+    colorOpacity: colorOpacity,
+    hasNoVendorPrefix: hasNoVendorPrefix,
+    isValidBackgroundAttachment: isValidBackgroundAttachment,
+    isValidBackgroundClip: isValidBackgroundClip,
+    isValidBackgroundOrigin: isValidBackgroundOrigin,
+    isValidBackgroundPosition: isValidBackgroundPosition,
+    isValidBackgroundPositionPart: isValidBackgroundPositionPart,
+    isValidBackgroundRepeat: isValidBackgroundRepeat,
+    isValidBackgroundSizePart: isValidBackgroundSizePart,
+    isValidColor: isValidColor,
+    isValidColorValue: isValidColorValue,
+    isValidFunction: isValidFunction,
+    isValidFunctionWithoutVendorPrefix: isValidFunctionWithoutVendorPrefix,
+    isValidGlobalValue: isValidGlobalValue,
+    isValidHexColor: isValidHexColor,
+    isValidHslaColor: isValidHslaColor,
+    isValidImage: isValidImage,
+    isValidKeywordValue: isValidKeywordValue,
+    isValidListStylePosition: isValidListStylePosition,
+    isValidListStyleType: isValidListStyleType,
+    isValidNamedColor: isValidNamedColor,
+    isValidRgbaColor: isValidRgbaColor,
+    isValidStyle: isValidStyle,
+    isValidTextShadow: isValidTextShadow.bind(null, compatibleCssUnitRegex),
+    isValidUnit: isValidUnit.bind(null, compatibleCssUnitAnyRegex),
+    isValidUnitWithoutFunction: isValidUnitWithoutFunction.bind(null, compatibleCssUnitRegex),
+    isValidUrl: isValidUrl,
+    isValidVariable: isValidVariable,
+    isValidVendorPrefixedValue: isValidVendorPrefixedValue,
+    isValidWidth: isValidWidth.bind(null, compatibleCssUnitRegex),
+    isValidZIndex: isValidZIndex
+  };
+}
+
+module.exports = validator;
diff --git a/node_modules/clean-css/lib/optimizer/wrap-for-optimizing.js b/node_modules/clean-css/lib/optimizer/wrap-for-optimizing.js
new file mode 100644
index 000000000..0fbfdb056
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/wrap-for-optimizing.js
@@ -0,0 +1,187 @@
+var Hack = require('./hack');
+
+var Marker = require('../tokenizer/marker');
+var Token = require('../tokenizer/token');
+
+var Match = {
+  ASTERISK: '*',
+  BACKSLASH: '\\',
+  BANG: '!',
+  BANG_SUFFIX_PATTERN: /!\w+$/,
+  IMPORTANT_TOKEN: '!important',
+  IMPORTANT_TOKEN_PATTERN: new RegExp('!important$', 'i'),
+  IMPORTANT_WORD: 'important',
+  IMPORTANT_WORD_PATTERN: new RegExp('important$', 'i'),
+  SUFFIX_BANG_PATTERN: /!$/,
+  UNDERSCORE: '_',
+  VARIABLE_REFERENCE_PATTERN: /var\(--.+\)$/
+};
+
+function wrapAll(properties, includeVariable) {
+  var wrapped = [];
+  var single;
+  var property;
+  var i;
+
+  for (i = properties.length - 1; i >= 0; i--) {
+    property = properties[i];
+
+    if (property[0] != Token.PROPERTY) {
+      continue;
+    }
+
+    if (!includeVariable && someVariableReferences(property)) {
+      continue;
+    }
+
+    single = wrapSingle(property);
+    single.all = properties;
+    single.position = i;
+    wrapped.unshift(single);
+  }
+
+  return wrapped;
+}
+
+function someVariableReferences(property) {
+  var i, l;
+  var value;
+
+  // skipping `property` and property name tokens
+  for (i = 2, l = property.length; i < l; i++) {
+    value = property[i];
+
+    if (value[0] != Token.PROPERTY_VALUE) {
+      continue;
+    }
+
+    if (isVariableReference(value[1])) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function isVariableReference(value) {
+  return Match.VARIABLE_REFERENCE_PATTERN.test(value);
+}
+
+function isMultiplex(property) {
+  var value;
+  var i, l;
+
+  for (i = 3, l = property.length; i < l; i++) {
+    value = property[i];
+
+    if (value[0] == Token.PROPERTY_VALUE && (value[1] == Marker.COMMA || value[1] == Marker.FORWARD_SLASH)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function hackFrom(property) {
+  var match = false;
+  var name = property[1][1];
+  var lastValue = property[property.length - 1];
+
+  if (name[0] == Match.UNDERSCORE) {
+    match = [Hack.UNDERSCORE];
+  } else if (name[0] == Match.ASTERISK) {
+    match = [Hack.ASTERISK];
+  } else if (lastValue[1][0] == Match.BANG && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN)) {
+    match = [Hack.BANG];
+  } else if (lastValue[1].indexOf(Match.BANG) > 0 && !lastValue[1].match(Match.IMPORTANT_WORD_PATTERN) && Match.BANG_SUFFIX_PATTERN.test(lastValue[1])) {
+    match = [Hack.BANG];
+  } else if (lastValue[1].indexOf(Match.BACKSLASH) > 0 && lastValue[1].indexOf(Match.BACKSLASH) == lastValue[1].length - Match.BACKSLASH.length - 1) {
+    match = [Hack.BACKSLASH, lastValue[1].substring(lastValue[1].indexOf(Match.BACKSLASH) + 1)];
+  } else if (lastValue[1].indexOf(Match.BACKSLASH) === 0 && lastValue[1].length == 2) {
+    match = [Hack.BACKSLASH, lastValue[1].substring(1)];
+  }
+
+  return match;
+}
+
+function isImportant(property) {
+  if (property.length < 3)
+    return false;
+
+  var lastValue = property[property.length - 1];
+  if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
+    return true;
+  } else if (Match.IMPORTANT_WORD_PATTERN.test(lastValue[1]) && Match.SUFFIX_BANG_PATTERN.test(property[property.length - 2][1])) {
+    return true;
+  }
+
+  return false;
+}
+
+function stripImportant(property) {
+  var lastValue = property[property.length - 1];
+  var oneButLastValue = property[property.length - 2];
+
+  if (Match.IMPORTANT_TOKEN_PATTERN.test(lastValue[1])) {
+    lastValue[1] = lastValue[1].replace(Match.IMPORTANT_TOKEN_PATTERN, '');
+  } else {
+    lastValue[1] = lastValue[1].replace(Match.IMPORTANT_WORD_PATTERN, '');
+    oneButLastValue[1] = oneButLastValue[1].replace(Match.SUFFIX_BANG_PATTERN, '');
+  }
+
+  if (lastValue[1].length === 0) {
+    property.pop();
+  }
+
+  if (oneButLastValue[1].length === 0) {
+    property.pop();
+  }
+}
+
+function stripPrefixHack(property) {
+  property[1][1] = property[1][1].substring(1);
+}
+
+function stripSuffixHack(property, hackFrom) {
+  var lastValue = property[property.length - 1];
+  lastValue[1] = lastValue[1]
+    .substring(0, lastValue[1].indexOf(hackFrom[0] == Hack.BACKSLASH ? Match.BACKSLASH : Match.BANG))
+    .trim();
+
+  if (lastValue[1].length === 0) {
+    property.pop();
+  }
+}
+
+function wrapSingle(property) {
+  var importantProperty = isImportant(property);
+  if (importantProperty) {
+    stripImportant(property);
+  }
+
+  var whichHack = hackFrom(property);
+  if (whichHack[0] == Hack.ASTERISK || whichHack[0] == Hack.UNDERSCORE) {
+    stripPrefixHack(property);
+  } else if (whichHack[0] == Hack.BACKSLASH || whichHack[0] == Hack.BANG) {
+    stripSuffixHack(property, whichHack);
+  }
+
+  return {
+    block: property[2] && property[2][0] == Token.PROPERTY_BLOCK,
+    components: [],
+    dirty: false,
+    hack: whichHack,
+    important: importantProperty,
+    name: property[1][1],
+    multiplex: property.length > 3 ? isMultiplex(property) : false,
+    position: 0,
+    shorthand: false,
+    unused: false,
+    value: property.slice(2)
+  };
+}
+
+module.exports = {
+  all: wrapAll,
+  single: wrapSingle
+};
diff --git a/node_modules/clean-css/lib/options/compatibility.js b/node_modules/clean-css/lib/options/compatibility.js
new file mode 100644
index 000000000..ca881c627
--- /dev/null
+++ b/node_modules/clean-css/lib/options/compatibility.js
@@ -0,0 +1,181 @@
+var DEFAULTS = {
+  '*': {
+    colors: {
+      opacity: true // rgba / hsla
+    },
+    properties: {
+      backgroundClipMerging: true, // background-clip to shorthand
+      backgroundOriginMerging: true, // background-origin to shorthand
+      backgroundSizeMerging: true, // background-size to shorthand
+      colors: true, // any kind of color transformations, like `#ff00ff` to `#f0f` or `#fff` into `red`
+      ieBangHack: false, // !ie suffix hacks on IE<8
+      ieFilters: false, // whether to preserve `filter` and `-ms-filter` properties
+      iePrefixHack: false, // underscore / asterisk prefix hacks on IE
+      ieSuffixHack: false, // \9 suffix hacks on IE6-9
+      merging: true, // merging properties into one
+      shorterLengthUnits: false, // optimize pixel units into `pt`, `pc` or `in` units
+      spaceAfterClosingBrace: true, // 'url() no-repeat' to 'url()no-repeat'
+      urlQuotes: false, // whether to wrap content of `url()` into quotes or not
+      zeroUnits: true // 0[unit] -> 0
+    },
+    selectors: {
+      adjacentSpace: false, // div+ nav Android stock browser hack
+      ie7Hack: false, // *+html hack
+      mergeablePseudoClasses: [
+        ':active',
+        ':after',
+        ':before',
+        ':empty',
+        ':checked',
+        ':disabled',
+        ':empty',
+        ':enabled',
+        ':first-child',
+        ':first-letter',
+        ':first-line',
+        ':first-of-type',
+        ':focus',
+        ':hover',
+        ':lang',
+        ':last-child',
+        ':last-of-type',
+        ':link',
+        ':not',
+        ':nth-child',
+        ':nth-last-child',
+        ':nth-last-of-type',
+        ':nth-of-type',
+        ':only-child',
+        ':only-of-type',
+        ':root',
+        ':target',
+        ':visited'
+      ], // selectors with these pseudo-classes can be merged as these are universally supported
+      mergeablePseudoElements: [
+        '::after',
+        '::before',
+        '::first-letter',
+        '::first-line'
+      ] // selectors with these pseudo-elements can be merged as these are universally supported
+    },
+    units: {
+      ch: true,
+      in: true,
+      pc: true,
+      pt: true,
+      rem: true,
+      vh: true,
+      vm: true, // vm is vmin on IE9+ see https://developer.mozilla.org/en-US/docs/Web/CSS/length
+      vmax: true,
+      vmin: true,
+      vw: true
+    }
+  }
+};
+
+DEFAULTS.ie11 = DEFAULTS['*'];
+
+DEFAULTS.ie10 = DEFAULTS['*'];
+
+DEFAULTS.ie9 = merge(DEFAULTS['*'], {
+  properties: {
+    ieFilters: true,
+    ieSuffixHack: true
+  }
+});
+
+DEFAULTS.ie8 = merge(DEFAULTS.ie9, {
+  colors: {
+    opacity: false
+  },
+  properties: {
+    backgroundClipMerging: false,
+    backgroundOriginMerging: false,
+    backgroundSizeMerging: false,
+    iePrefixHack: true,
+    merging: false
+  },
+  selectors: {
+    mergeablePseudoClasses: [
+      ':after',
+      ':before',
+      ':first-child',
+      ':first-letter',
+      ':focus',
+      ':hover',
+      ':visited'
+    ],
+    mergeablePseudoElements: []
+  },
+  units: {
+    ch: false,
+    rem: false,
+    vh: false,
+    vm: false,
+    vmax: false,
+    vmin: false,
+    vw: false
+  }
+});
+
+DEFAULTS.ie7 = merge(DEFAULTS.ie8, {
+  properties: {
+    ieBangHack: true
+  },
+  selectors: {
+    ie7Hack: true,
+    mergeablePseudoClasses: [
+      ':first-child',
+      ':first-letter',
+      ':hover',
+      ':visited'
+    ]
+  },
+});
+
+function compatibilityFrom(source) {
+  return merge(DEFAULTS['*'], calculateSource(source));
+}
+
+function merge(source, target) {
+  for (var key in source) {
+    var value = source[key];
+
+    if (typeof value === 'object' && !Array.isArray(value)) {
+      target[key] = merge(value, target[key] || {});
+    } else {
+      target[key] = key in target ? target[key] : value;
+    }
+  }
+
+  return target;
+}
+
+function calculateSource(source) {
+  if (typeof source == 'object')
+    return source;
+
+  if (!/[,\+\-]/.test(source))
+    return DEFAULTS[source] || DEFAULTS['*'];
+
+  var parts = source.split(',');
+  var template = parts[0] in DEFAULTS ?
+    DEFAULTS[parts.shift()] :
+    DEFAULTS['*'];
+
+  source = {};
+
+  parts.forEach(function (part) {
+    var isAdd = part[0] == '+';
+    var key = part.substring(1).split('.');
+    var group = key[0];
+    var option = key[1];
+
+    source[group] = source[group] || {};
+    source[group][option] = isAdd;
+  });
+
+  return merge(template, source);
+}
+
+module.exports = compatibilityFrom;
diff --git a/node_modules/clean-css/lib/options/format.js b/node_modules/clean-css/lib/options/format.js
new file mode 100644
index 000000000..afcf5c967
--- /dev/null
+++ b/node_modules/clean-css/lib/options/format.js
@@ -0,0 +1,185 @@
+var override = require('../utils/override');
+
+var Breaks = {
+  AfterAtRule: 'afterAtRule',
+  AfterBlockBegins: 'afterBlockBegins',
+  AfterBlockEnds: 'afterBlockEnds',
+  AfterComment: 'afterComment',
+  AfterProperty: 'afterProperty',
+  AfterRuleBegins: 'afterRuleBegins',
+  AfterRuleEnds: 'afterRuleEnds',
+  BeforeBlockEnds: 'beforeBlockEnds',
+  BetweenSelectors: 'betweenSelectors'
+};
+
+var IndentWith = {
+  Space: ' ',
+  Tab: '\t'
+};
+
+var Spaces = {
+  AroundSelectorRelation: 'aroundSelectorRelation',
+  BeforeBlockBegins: 'beforeBlockBegins',
+  BeforeValue: 'beforeValue'
+};
+
+var DEFAULTS = {
+  breaks: breaks(false),
+  indentBy: 0,
+  indentWith: IndentWith.Space,
+  spaces: spaces(false),
+  wrapAt: false
+};
+
+var BEAUTIFY_ALIAS = 'beautify';
+var KEEP_BREAKS_ALIAS = 'keep-breaks';
+
+var OPTION_SEPARATOR = ';';
+var OPTION_NAME_VALUE_SEPARATOR = ':';
+var HASH_VALUES_OPTION_SEPARATOR = ',';
+var HASH_VALUES_NAME_VALUE_SEPARATOR = '=';
+
+var FALSE_KEYWORD_1 = 'false';
+var FALSE_KEYWORD_2 = 'off';
+var TRUE_KEYWORD_1 = 'true';
+var TRUE_KEYWORD_2 = 'on';
+
+function breaks(value) {
+  var breakOptions = {};
+
+  breakOptions[Breaks.AfterAtRule] = value;
+  breakOptions[Breaks.AfterBlockBegins] = value;
+  breakOptions[Breaks.AfterBlockEnds] = value;
+  breakOptions[Breaks.AfterComment] = value;
+  breakOptions[Breaks.AfterProperty] = value;
+  breakOptions[Breaks.AfterRuleBegins] = value;
+  breakOptions[Breaks.AfterRuleEnds] = value;
+  breakOptions[Breaks.BeforeBlockEnds] = value;
+  breakOptions[Breaks.BetweenSelectors] = value;
+
+  return breakOptions;
+}
+
+function spaces(value) {
+  var spaceOptions = {};
+
+  spaceOptions[Spaces.AroundSelectorRelation] = value;
+  spaceOptions[Spaces.BeforeBlockBegins] = value;
+  spaceOptions[Spaces.BeforeValue] = value;
+
+  return spaceOptions;
+}
+
+function formatFrom(source) {
+  if (source === undefined || source === false) {
+    return false;
+  }
+
+  if (typeof source == 'object' && 'indentBy' in source) {
+    source = override(source, { indentBy: parseInt(source.indentBy) });
+  }
+
+  if (typeof source == 'object' && 'indentWith' in source) {
+    source = override(source, { indentWith: mapIndentWith(source.indentWith) });
+  }
+
+  if (typeof source == 'object') {
+    return override(DEFAULTS, source);
+  }
+
+  if (typeof source == 'object') {
+    return override(DEFAULTS, source);
+  }
+
+  if (typeof source == 'string' && source == BEAUTIFY_ALIAS) {
+    return override(DEFAULTS, {
+      breaks: breaks(true),
+      indentBy: 2,
+      spaces: spaces(true)
+    });
+  }
+
+  if (typeof source == 'string' && source == KEEP_BREAKS_ALIAS) {
+    return override(DEFAULTS, {
+      breaks: {
+        afterAtRule: true,
+        afterBlockBegins: true,
+        afterBlockEnds: true,
+        afterComment: true,
+        afterRuleEnds: true,
+        beforeBlockEnds: true
+      }
+    });
+  }
+
+  if (typeof source == 'string') {
+    return override(DEFAULTS, toHash(source));
+  }
+
+  return DEFAULTS;
+}
+
+function toHash(string) {
+  return string
+    .split(OPTION_SEPARATOR)
+    .reduce(function (accumulator, directive) {
+      var parts = directive.split(OPTION_NAME_VALUE_SEPARATOR);
+      var name = parts[0];
+      var value = parts[1];
+
+      if (name == 'breaks' || name == 'spaces') {
+        accumulator[name] = hashValuesToHash(value);
+      } else if (name == 'indentBy' || name == 'wrapAt') {
+        accumulator[name] = parseInt(value);
+      } else if (name == 'indentWith') {
+        accumulator[name] = mapIndentWith(value);
+      }
+
+      return accumulator;
+    }, {});
+}
+
+function hashValuesToHash(string) {
+  return string
+    .split(HASH_VALUES_OPTION_SEPARATOR)
+    .reduce(function (accumulator, directive) {
+      var parts = directive.split(HASH_VALUES_NAME_VALUE_SEPARATOR);
+      var name = parts[0];
+      var value = parts[1];
+
+      accumulator[name] = normalizeValue(value);
+
+      return accumulator;
+    }, {});
+}
+
+
+function normalizeValue(value) {
+  switch (value) {
+    case FALSE_KEYWORD_1:
+    case FALSE_KEYWORD_2:
+      return false;
+    case TRUE_KEYWORD_1:
+    case TRUE_KEYWORD_2:
+      return true;
+    default:
+      return value;
+  }
+}
+
+function mapIndentWith(value) {
+  switch (value) {
+    case 'space':
+      return IndentWith.Space;
+    case 'tab':
+      return IndentWith.Tab;
+    default:
+      return value;
+  }
+}
+
+module.exports = {
+  Breaks: Breaks,
+  Spaces: Spaces,
+  formatFrom: formatFrom
+};
diff --git a/node_modules/clean-css/lib/options/inline-request.js b/node_modules/clean-css/lib/options/inline-request.js
new file mode 100644
index 000000000..1e14c6393
--- /dev/null
+++ b/node_modules/clean-css/lib/options/inline-request.js
@@ -0,0 +1,22 @@
+var url = require('url');
+
+var override = require('../utils/override');
+
+function inlineRequestFrom(option) {
+  return override(
+    /* jshint camelcase: false */
+    proxyOptionsFrom(process.env.HTTP_PROXY || process.env.http_proxy),
+    option || {}
+  );
+}
+
+function proxyOptionsFrom(httpProxy) {
+  return httpProxy ?
+    {
+      hostname: url.parse(httpProxy).hostname,
+      port: parseInt(url.parse(httpProxy).port)
+    } :
+    {};
+}
+
+module.exports = inlineRequestFrom;
diff --git a/node_modules/clean-css/lib/options/inline-timeout.js b/node_modules/clean-css/lib/options/inline-timeout.js
new file mode 100644
index 000000000..c7fb454d5
--- /dev/null
+++ b/node_modules/clean-css/lib/options/inline-timeout.js
@@ -0,0 +1,7 @@
+var DEFAULT_TIMEOUT = 5000;
+
+function inlineTimeoutFrom(option) {
+  return option || DEFAULT_TIMEOUT;
+}
+
+module.exports = inlineTimeoutFrom;
diff --git a/node_modules/clean-css/lib/options/inline.js b/node_modules/clean-css/lib/options/inline.js
new file mode 100644
index 000000000..4a6997075
--- /dev/null
+++ b/node_modules/clean-css/lib/options/inline.js
@@ -0,0 +1,11 @@
+function inlineOptionsFrom(rules) {
+  if (Array.isArray(rules)) {
+    return rules;
+  }
+
+  return undefined === rules ?
+    ['local'] :
+    rules.split(',');
+}
+
+module.exports = inlineOptionsFrom;
diff --git a/node_modules/clean-css/lib/options/optimization-level.js b/node_modules/clean-css/lib/options/optimization-level.js
new file mode 100644
index 000000000..d9828287b
--- /dev/null
+++ b/node_modules/clean-css/lib/options/optimization-level.js
@@ -0,0 +1,213 @@
+var roundingPrecisionFrom = require('./rounding-precision').roundingPrecisionFrom;
+
+var override = require('../utils/override');
+
+var OptimizationLevel = {
+  Zero: '0',
+  One: '1',
+  Two: '2'
+};
+
+var DEFAULTS = {};
+
+DEFAULTS[OptimizationLevel.Zero] = {};
+DEFAULTS[OptimizationLevel.One] = {
+  cleanupCharsets: true,
+  normalizeUrls: true,
+  optimizeBackground: true,
+  optimizeBorderRadius: true,
+  optimizeFilter: true,
+  optimizeFont: true,
+  optimizeFontWeight: true,
+  optimizeOutline: true,
+  removeNegativePaddings: true,
+  removeQuotes: true,
+  removeWhitespace: true,
+  replaceMultipleZeros: true,
+  replaceTimeUnits: true,
+  replaceZeroUnits: true,
+  roundingPrecision: roundingPrecisionFrom(undefined),
+  selectorsSortingMethod: 'standard',
+  specialComments: 'all',
+  tidyAtRules: true,
+  tidyBlockScopes: true,
+  tidySelectors: true,
+  transform: noop
+};
+DEFAULTS[OptimizationLevel.Two] = {
+  mergeAdjacentRules: true,
+  mergeIntoShorthands: true,
+  mergeMedia: true,
+  mergeNonAdjacentRules: true,
+  mergeSemantically: false,
+  overrideProperties: true,
+  reduceNonAdjacentRules: true,
+  removeDuplicateFontRules: true,
+  removeDuplicateMediaBlocks: true,
+  removeDuplicateRules: true,
+  restructureRules: false
+};
+
+var ALL_KEYWORD_1 = '*';
+var ALL_KEYWORD_2 = 'all';
+var FALSE_KEYWORD_1 = 'false';
+var FALSE_KEYWORD_2 = 'off';
+var TRUE_KEYWORD_1 = 'true';
+var TRUE_KEYWORD_2 = 'on';
+
+var OPTION_SEPARATOR = ';';
+var OPTION_VALUE_SEPARATOR = ':';
+
+function noop() {}
+
+function optimizationLevelFrom(source) {
+  var level = override(DEFAULTS, {});
+  var Zero = OptimizationLevel.Zero;
+  var One = OptimizationLevel.One;
+  var Two = OptimizationLevel.Two;
+
+
+  if (undefined === source) {
+    delete level[Two];
+    return level;
+  }
+
+  if (typeof source == 'string') {
+    source = parseInt(source);
+  }
+
+  if (typeof source == 'number' && source === parseInt(Two)) {
+    return level;
+  }
+
+  if (typeof source == 'number' && source === parseInt(One)) {
+    delete level[Two];
+    return level;
+  }
+
+  if (typeof source == 'number' && source === parseInt(Zero)) {
+    delete level[Two];
+    delete level[One];
+    return level;
+  }
+
+  if (typeof source == 'object') {
+    source = covertValuesToHashes(source);
+  }
+
+  if (One in source && 'roundingPrecision' in source[One]) {
+    source[One].roundingPrecision = roundingPrecisionFrom(source[One].roundingPrecision);
+  }
+
+  if (Zero in source || One in source || Two in source) {
+    level[Zero] = override(level[Zero], source[Zero]);
+  }
+
+  if (One in source && ALL_KEYWORD_1 in source[One]) {
+    level[One] = override(level[One], defaults(One, normalizeValue(source[One][ALL_KEYWORD_1])));
+    delete source[One][ALL_KEYWORD_1];
+  }
+
+  if (One in source && ALL_KEYWORD_2 in source[One]) {
+    level[One] = override(level[One], defaults(One, normalizeValue(source[One][ALL_KEYWORD_2])));
+    delete source[One][ALL_KEYWORD_2];
+  }
+
+  if (One in source || Two in source) {
+    level[One] = override(level[One], source[One]);
+  } else {
+    delete level[One];
+  }
+
+  if (Two in source && ALL_KEYWORD_1 in source[Two]) {
+    level[Two] = override(level[Two], defaults(Two, normalizeValue(source[Two][ALL_KEYWORD_1])));
+    delete source[Two][ALL_KEYWORD_1];
+  }
+
+  if (Two in source && ALL_KEYWORD_2 in source[Two]) {
+    level[Two] = override(level[Two], defaults(Two, normalizeValue(source[Two][ALL_KEYWORD_2])));
+    delete source[Two][ALL_KEYWORD_2];
+  }
+
+  if (Two in source) {
+    level[Two] = override(level[Two], source[Two]);
+  } else {
+    delete level[Two];
+  }
+
+  return level;
+}
+
+function defaults(level, value) {
+  var options = override(DEFAULTS[level], {});
+  var key;
+
+  for (key in options) {
+    if (typeof options[key] == 'boolean') {
+      options[key] = value;
+    }
+  }
+
+  return options;
+}
+
+function normalizeValue(value) {
+  switch (value) {
+    case FALSE_KEYWORD_1:
+    case FALSE_KEYWORD_2:
+      return false;
+    case TRUE_KEYWORD_1:
+    case TRUE_KEYWORD_2:
+      return true;
+    default:
+      return value;
+  }
+}
+
+function covertValuesToHashes(source) {
+  var clonedSource = override(source, {});
+  var level;
+  var i;
+
+  for (i = 0; i <= 2; i++) {
+    level = '' + i;
+
+    if (level in clonedSource && (clonedSource[level] === undefined || clonedSource[level] === false)) {
+      delete clonedSource[level];
+    }
+
+    if (level in clonedSource && clonedSource[level] === true) {
+      clonedSource[level] = {};
+    }
+
+    if (level in clonedSource && typeof clonedSource[level] == 'string') {
+      clonedSource[level] = covertToHash(clonedSource[level], level);
+    }
+  }
+
+  return clonedSource;
+}
+
+function covertToHash(asString, level) {
+  return asString
+    .split(OPTION_SEPARATOR)
+    .reduce(function (accumulator, directive) {
+      var parts = directive.split(OPTION_VALUE_SEPARATOR);
+      var name = parts[0];
+      var value = parts[1];
+      var normalizedValue = normalizeValue(value);
+
+      if (ALL_KEYWORD_1 == name || ALL_KEYWORD_2 == name) {
+        accumulator = override(accumulator, defaults(level, normalizedValue));
+      } else {
+        accumulator[name] = normalizedValue;
+      }
+
+      return accumulator;
+    }, {});
+}
+
+module.exports = {
+  OptimizationLevel: OptimizationLevel,
+  optimizationLevelFrom: optimizationLevelFrom,
+};
diff --git a/node_modules/clean-css/lib/options/rebase-to.js b/node_modules/clean-css/lib/options/rebase-to.js
new file mode 100644
index 000000000..134b4a382
--- /dev/null
+++ b/node_modules/clean-css/lib/options/rebase-to.js
@@ -0,0 +1,7 @@
+var path = require('path');
+
+function rebaseToFrom(option) {
+  return option ? path.resolve(option) : process.cwd();
+}
+
+module.exports = rebaseToFrom;
diff --git a/node_modules/clean-css/lib/options/rebase.js b/node_modules/clean-css/lib/options/rebase.js
new file mode 100644
index 000000000..999c83f50
--- /dev/null
+++ b/node_modules/clean-css/lib/options/rebase.js
@@ -0,0 +1,5 @@
+function rebaseFrom(rebaseOption) {
+  return undefined === rebaseOption ? true : !!rebaseOption;
+}
+
+module.exports = rebaseFrom;
diff --git a/node_modules/clean-css/lib/options/rounding-precision.js b/node_modules/clean-css/lib/options/rounding-precision.js
new file mode 100644
index 000000000..42ecf1b4d
--- /dev/null
+++ b/node_modules/clean-css/lib/options/rounding-precision.js
@@ -0,0 +1,88 @@
+var override = require('../utils/override');
+
+var INTEGER_PATTERN = /^\d+$/;
+
+var ALL_UNITS = ['*', 'all'];
+var DEFAULT_PRECISION = 'off'; // all precision changes are disabled
+var DIRECTIVES_SEPARATOR = ','; // e.g. *=5,px=3
+var DIRECTIVE_VALUE_SEPARATOR = '='; // e.g. *=5
+
+function roundingPrecisionFrom(source) {
+  return override(defaults(DEFAULT_PRECISION), buildPrecisionFrom(source));
+}
+
+function defaults(value) {
+  return {
+    'ch': value,
+    'cm': value,
+    'em': value,
+    'ex': value,
+    'in': value,
+    'mm': value,
+    'pc': value,
+    'pt': value,
+    'px': value,
+    'q': value,
+    'rem': value,
+    'vh': value,
+    'vmax': value,
+    'vmin': value,
+    'vw': value,
+    '%': value
+  };
+}
+
+function buildPrecisionFrom(source) {
+  if (source === null || source === undefined) {
+    return {};
+  }
+
+  if (typeof source == 'boolean') {
+    return {};
+  }
+
+  if (typeof source == 'number' && source == -1) {
+    return defaults(DEFAULT_PRECISION);
+  }
+
+  if (typeof source == 'number') {
+    return defaults(source);
+  }
+
+  if (typeof source == 'string' && INTEGER_PATTERN.test(source)) {
+    return defaults(parseInt(source));
+  }
+
+  if (typeof source == 'string' && source == DEFAULT_PRECISION) {
+    return defaults(DEFAULT_PRECISION);
+  }
+
+  if (typeof source == 'object') {
+    return source;
+  }
+
+  return source
+    .split(DIRECTIVES_SEPARATOR)
+    .reduce(function (accumulator, directive) {
+      var directiveParts = directive.split(DIRECTIVE_VALUE_SEPARATOR);
+      var name = directiveParts[0];
+      var value = parseInt(directiveParts[1]);
+
+      if (isNaN(value) || value == -1) {
+        value = DEFAULT_PRECISION;
+      }
+
+      if (ALL_UNITS.indexOf(name) > -1) {
+        accumulator = override(accumulator, defaults(value));
+      } else {
+        accumulator[name] = value;
+      }
+
+      return accumulator;
+    }, {});
+}
+
+module.exports = {
+  DEFAULT: DEFAULT_PRECISION,
+  roundingPrecisionFrom: roundingPrecisionFrom
+};
diff --git a/node_modules/clean-css/lib/reader/apply-source-maps.js b/node_modules/clean-css/lib/reader/apply-source-maps.js
new file mode 100644
index 000000000..d2f87250e
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/apply-source-maps.js
@@ -0,0 +1,245 @@
+var fs = require('fs');
+var path = require('path');
+
+var isAllowedResource = require('./is-allowed-resource');
+var loadRemoteResource = require('./load-remote-resource');
+var matchDataUri = require('./match-data-uri');
+var rebaseLocalMap = require('./rebase-local-map');
+var rebaseRemoteMap = require('./rebase-remote-map');
+
+var Token = require('../tokenizer/token');
+var hasProtocol = require('../utils/has-protocol');
+var isDataUriResource = require('../utils/is-data-uri-resource');
+var isRemoteResource = require('../utils/is-remote-resource');
+
+var MAP_MARKER_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/;
+
+function applySourceMaps(tokens, context, callback) {
+  var applyContext = {
+    callback: callback,
+    index: 0,
+    inline: context.options.inline,
+    inlineRequest: context.options.inlineRequest,
+    inlineTimeout: context.options.inlineTimeout,
+    inputSourceMapTracker: context.inputSourceMapTracker,
+    localOnly: context.localOnly,
+    processedTokens: [],
+    rebaseTo: context.options.rebaseTo,
+    sourceTokens: tokens,
+    warnings: context.warnings
+  };
+
+  return context.options.sourceMap && tokens.length > 0 ?
+    doApplySourceMaps(applyContext) :
+    callback(tokens);
+}
+
+function doApplySourceMaps(applyContext) {
+  var singleSourceTokens = [];
+  var lastSource = findTokenSource(applyContext.sourceTokens[0]);
+  var source;
+  var token;
+  var l;
+
+  for (l = applyContext.sourceTokens.length; applyContext.index < l; applyContext.index++) {
+    token = applyContext.sourceTokens[applyContext.index];
+    source = findTokenSource(token);
+
+    if (source != lastSource) {
+      singleSourceTokens = [];
+      lastSource = source;
+    }
+
+    singleSourceTokens.push(token);
+    applyContext.processedTokens.push(token);
+
+    if (token[0] == Token.COMMENT && MAP_MARKER_PATTERN.test(token[1])) {
+      return fetchAndApplySourceMap(token[1], source, singleSourceTokens, applyContext);
+    }
+  }
+
+  return applyContext.callback(applyContext.processedTokens);
+}
+
+function findTokenSource(token) {
+  var scope;
+  var metadata;
+
+  if (token[0] == Token.AT_RULE || token[0] == Token.COMMENT) {
+    metadata = token[2][0];
+  } else {
+    scope = token[1][0];
+    metadata = scope[2][0];
+  }
+
+  return metadata[2];
+}
+
+function fetchAndApplySourceMap(sourceMapComment, source, singleSourceTokens, applyContext) {
+  return extractInputSourceMapFrom(sourceMapComment, applyContext, function (inputSourceMap) {
+    if (inputSourceMap) {
+      applyContext.inputSourceMapTracker.track(source, inputSourceMap);
+      applySourceMapRecursively(singleSourceTokens, applyContext.inputSourceMapTracker);
+    }
+
+    applyContext.index++;
+    return doApplySourceMaps(applyContext);
+  });
+}
+
+function extractInputSourceMapFrom(sourceMapComment, applyContext, whenSourceMapReady) {
+  var uri = MAP_MARKER_PATTERN.exec(sourceMapComment)[1];
+  var absoluteUri;
+  var sourceMap;
+  var rebasedMap;
+
+  if (isDataUriResource(uri)) {
+    sourceMap = extractInputSourceMapFromDataUri(uri);
+    return whenSourceMapReady(sourceMap);
+  } else if (isRemoteResource(uri)) {
+    return loadInputSourceMapFromRemoteUri(uri, applyContext, function (sourceMap) {
+      var parsedMap;
+
+      if (sourceMap) {
+        parsedMap = JSON.parse(sourceMap);
+        rebasedMap = rebaseRemoteMap(parsedMap, uri);
+        whenSourceMapReady(rebasedMap);
+      } else {
+        whenSourceMapReady(null);
+      }
+    });
+  } else {
+    // at this point `uri` is already rebased, see lib/reader/rebase.js#rebaseSourceMapComment
+    // it is rebased to be consistent with rebasing other URIs
+    // however here we need to resolve it back to read it from disk
+    absoluteUri = path.resolve(applyContext.rebaseTo, uri);
+    sourceMap = loadInputSourceMapFromLocalUri(absoluteUri, applyContext);
+
+    if (sourceMap) {
+      rebasedMap = rebaseLocalMap(sourceMap, absoluteUri, applyContext.rebaseTo);
+      return whenSourceMapReady(rebasedMap);
+    } else {
+      return whenSourceMapReady(null);
+    }
+  }
+}
+
+function extractInputSourceMapFromDataUri(uri) {
+  var dataUriMatch = matchDataUri(uri);
+  var charset = dataUriMatch[2] ? dataUriMatch[2].split(/[=;]/)[2] : 'us-ascii';
+  var encoding = dataUriMatch[3] ? dataUriMatch[3].split(';')[1] : 'utf8';
+  var data = encoding == 'utf8' ? global.unescape(dataUriMatch[4]) : dataUriMatch[4];
+
+  var buffer = new Buffer(data, encoding);
+  buffer.charset = charset;
+
+  return JSON.parse(buffer.toString());
+}
+
+function loadInputSourceMapFromRemoteUri(uri, applyContext, whenLoaded) {
+  var isAllowed = isAllowedResource(uri, true, applyContext.inline);
+  var isRuntimeResource = !hasProtocol(uri);
+
+  if (applyContext.localOnly) {
+    applyContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.');
+    return whenLoaded(null);
+  } else if (isRuntimeResource) {
+    applyContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.');
+    return whenLoaded(null);
+  } else if (!isAllowed) {
+    applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
+    return whenLoaded(null);
+  }
+
+  loadRemoteResource(uri, applyContext.inlineRequest, applyContext.inlineTimeout, function (error, body) {
+    if (error) {
+      applyContext.warnings.push('Missing source map at "' + uri + '" - ' + error);
+      return whenLoaded(null);
+    }
+
+    whenLoaded(body);
+  });
+}
+
+function loadInputSourceMapFromLocalUri(uri, applyContext) {
+  var isAllowed = isAllowedResource(uri, false, applyContext.inline);
+  var sourceMap;
+
+  if (!fs.existsSync(uri) || !fs.statSync(uri).isFile()) {
+    applyContext.warnings.push('Ignoring local source map at "' + uri + '" as resource is missing.');
+    return null;
+  } else if (!isAllowed) {
+    applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
+    return null;
+  }
+
+  sourceMap = fs.readFileSync(uri, 'utf-8');
+  return JSON.parse(sourceMap);
+}
+
+function applySourceMapRecursively(tokens, inputSourceMapTracker) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    switch (token[0]) {
+      case Token.AT_RULE:
+        applySourceMapTo(token, inputSourceMapTracker);
+        break;
+      case Token.AT_RULE_BLOCK:
+        applySourceMapRecursively(token[1], inputSourceMapTracker);
+        applySourceMapRecursively(token[2], inputSourceMapTracker);
+        break;
+      case Token.AT_RULE_BLOCK_SCOPE:
+        applySourceMapTo(token, inputSourceMapTracker);
+        break;
+      case Token.NESTED_BLOCK:
+        applySourceMapRecursively(token[1], inputSourceMapTracker);
+        applySourceMapRecursively(token[2], inputSourceMapTracker);
+        break;
+      case Token.NESTED_BLOCK_SCOPE:
+        applySourceMapTo(token, inputSourceMapTracker);
+        break;
+      case Token.COMMENT:
+        applySourceMapTo(token, inputSourceMapTracker);
+        break;
+      case Token.PROPERTY:
+        applySourceMapRecursively(token, inputSourceMapTracker);
+        break;
+      case Token.PROPERTY_BLOCK:
+        applySourceMapRecursively(token[1], inputSourceMapTracker);
+        break;
+      case Token.PROPERTY_NAME:
+        applySourceMapTo(token, inputSourceMapTracker);
+        break;
+      case Token.PROPERTY_VALUE:
+        applySourceMapTo(token, inputSourceMapTracker);
+        break;
+      case Token.RULE:
+        applySourceMapRecursively(token[1], inputSourceMapTracker);
+        applySourceMapRecursively(token[2], inputSourceMapTracker);
+        break;
+      case Token.RULE_SCOPE:
+        applySourceMapTo(token, inputSourceMapTracker);
+    }
+  }
+
+  return tokens;
+}
+
+function applySourceMapTo(token, inputSourceMapTracker) {
+  var value = token[1];
+  var metadata = token[2];
+  var newMetadata = [];
+  var i, l;
+
+  for (i = 0, l = metadata.length; i < l; i++) {
+    newMetadata.push(inputSourceMapTracker.originalPositionFor(metadata[i], value.length));
+  }
+
+  token[2] = newMetadata;
+}
+
+module.exports = applySourceMaps;
diff --git a/node_modules/clean-css/lib/reader/extract-import-url-and-media.js b/node_modules/clean-css/lib/reader/extract-import-url-and-media.js
new file mode 100644
index 000000000..e309c2f71
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/extract-import-url-and-media.js
@@ -0,0 +1,35 @@
+var split = require('../utils/split');
+
+var BRACE_PREFIX = /^\(/;
+var BRACE_SUFFIX = /\)$/;
+var IMPORT_PREFIX_PATTERN = /^@import/i;
+var QUOTE_PREFIX_PATTERN = /['"]\s*/;
+var QUOTE_SUFFIX_PATTERN = /\s*['"]/;
+var URL_PREFIX_PATTERN = /^url\(\s*/i;
+var URL_SUFFIX_PATTERN = /\s*\)/i;
+
+function extractImportUrlAndMedia(atRuleValue) {
+  var uri;
+  var mediaQuery;
+  var stripped;
+  var parts;
+
+  stripped = atRuleValue
+    .replace(IMPORT_PREFIX_PATTERN, '')
+    .trim()
+    .replace(URL_PREFIX_PATTERN, '(')
+    .replace(URL_SUFFIX_PATTERN, ')')
+    .replace(QUOTE_PREFIX_PATTERN, '')
+    .replace(QUOTE_SUFFIX_PATTERN, '');
+
+  parts = split(stripped, ' ');
+
+  uri = parts[0]
+    .replace(BRACE_PREFIX, '')
+    .replace(BRACE_SUFFIX, '');
+  mediaQuery = parts.slice(1).join(' ');
+
+  return [uri, mediaQuery];
+}
+
+module.exports = extractImportUrlAndMedia;
diff --git a/node_modules/clean-css/lib/reader/input-source-map-tracker.js b/node_modules/clean-css/lib/reader/input-source-map-tracker.js
new file mode 100644
index 000000000..ea2c03467
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/input-source-map-tracker.js
@@ -0,0 +1,54 @@
+var SourceMapConsumer = require('source-map').SourceMapConsumer;
+
+function inputSourceMapTracker() {
+  var maps = {};
+
+  return {
+    all: all.bind(null, maps),
+    isTracking: isTracking.bind(null, maps),
+    originalPositionFor: originalPositionFor.bind(null, maps),
+    track: track.bind(null, maps)
+  };
+}
+
+function all(maps) {
+  return maps;
+}
+
+function isTracking(maps, source) {
+  return source in maps;
+}
+
+function originalPositionFor(maps, metadata, range, selectorFallbacks) {
+  var line = metadata[0];
+  var column = metadata[1];
+  var source = metadata[2];
+  var position = {
+    line: line,
+    column: column + range
+  };
+  var originalPosition;
+
+  while (!originalPosition && position.column > column) {
+    position.column--;
+    originalPosition = maps[source].originalPositionFor(position);
+  }
+
+  if (originalPosition.line === null && line > 1 && selectorFallbacks > 0) {
+    return originalPositionFor(maps, [line - 1, column, source], range, selectorFallbacks - 1);
+  }
+
+  return originalPosition.line !== null ?
+    toMetadata(originalPosition) :
+    metadata;
+}
+
+function toMetadata(asHash) {
+  return [asHash.line, asHash.column, asHash.source];
+}
+
+function track(maps, source, data) {
+  maps[source] = new SourceMapConsumer(data);
+}
+
+module.exports = inputSourceMapTracker;
diff --git a/node_modules/clean-css/lib/reader/is-allowed-resource.js b/node_modules/clean-css/lib/reader/is-allowed-resource.js
new file mode 100644
index 000000000..043066e42
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/is-allowed-resource.js
@@ -0,0 +1,77 @@
+var path = require('path');
+var url = require('url');
+
+var isRemoteResource = require('../utils/is-remote-resource');
+var hasProtocol = require('../utils/has-protocol');
+
+var HTTP_PROTOCOL = 'http:';
+
+function isAllowedResource(uri, isRemote, rules) {
+  var match;
+  var absoluteUri;
+  var allowed = isRemote ? false : true;
+  var rule;
+  var isNegated;
+  var normalizedRule;
+  var i;
+
+  if (rules.length === 0) {
+    return false;
+  }
+
+  if (isRemote && !hasProtocol(uri)) {
+    uri = HTTP_PROTOCOL + uri;
+  }
+
+  match = isRemote ?
+    url.parse(uri).host :
+    uri;
+
+  absoluteUri = isRemote ?
+    uri :
+    path.resolve(uri);
+
+  for (i = 0; i < rules.length; i++) {
+    rule = rules[i];
+    isNegated = rule[0] == '!';
+    normalizedRule = rule.substring(1);
+
+    if (isNegated && isRemote && isRemoteRule(normalizedRule)) {
+      allowed = allowed && !isAllowedResource(uri, true, [normalizedRule]);
+    } else if (isNegated && !isRemote && !isRemoteRule(normalizedRule)) {
+      allowed = allowed && !isAllowedResource(uri, false, [normalizedRule]);
+    } else if (isNegated) {
+      allowed = allowed && true;
+    } else if (rule == 'all') {
+      allowed = true;
+    } else if (isRemote && rule == 'local') {
+      allowed = allowed || false;
+    } else if (isRemote && rule == 'remote') {
+      allowed = true;
+    } else if (!isRemote && rule == 'remote') {
+      allowed = false;
+    } else if (!isRemote && rule == 'local') {
+      allowed = true;
+    } else if (rule === match) {
+      allowed = true;
+    } else if (rule === uri) {
+      allowed = true;
+    } else if (isRemote && absoluteUri.indexOf(rule) === 0) {
+      allowed = true;
+    } else if (!isRemote && absoluteUri.indexOf(path.resolve(rule)) === 0) {
+      allowed = true;
+    } else if (isRemote != isRemoteRule(normalizedRule)) {
+      allowed = allowed && true;
+    } else {
+      allowed = false;
+    }
+  }
+
+  return allowed;
+}
+
+function isRemoteRule(rule) {
+  return isRemoteResource(rule) || url.parse(HTTP_PROTOCOL + '//' + rule).host == rule;
+}
+
+module.exports = isAllowedResource;
diff --git a/node_modules/clean-css/lib/reader/load-original-sources.js b/node_modules/clean-css/lib/reader/load-original-sources.js
new file mode 100644
index 000000000..dbe2cad09
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/load-original-sources.js
@@ -0,0 +1,126 @@
+var fs = require('fs');
+var path = require('path');
+
+var isAllowedResource = require('./is-allowed-resource');
+var loadRemoteResource = require('./load-remote-resource');
+
+var hasProtocol = require('../utils/has-protocol');
+var isRemoteResource = require('../utils/is-remote-resource');
+
+function loadOriginalSources(context, callback) {
+  var loadContext = {
+    callback: callback,
+    index: 0,
+    inline: context.options.inline,
+    inlineRequest: context.options.inlineRequest,
+    inlineTimeout: context.options.inlineTimeout,
+    localOnly: context.localOnly,
+    rebaseTo: context.options.rebaseTo,
+    sourcesContent: context.sourcesContent,
+    uriToSource: uriToSourceMapping(context.inputSourceMapTracker.all()),
+    warnings: context.warnings
+  };
+
+  return context.options.sourceMap && context.options.sourceMapInlineSources ?
+    doLoadOriginalSources(loadContext) :
+    callback();
+}
+
+function uriToSourceMapping(allSourceMapConsumers) {
+  var mapping = {};
+  var consumer;
+  var uri;
+  var source;
+  var i, l;
+
+  for (source in allSourceMapConsumers) {
+    consumer = allSourceMapConsumers[source];
+
+    for (i = 0, l = consumer.sources.length; i < l; i++) {
+      uri = consumer.sources[i];
+      source = consumer.sourceContentFor(uri, true);
+
+      mapping[uri] = source;
+    }
+  }
+
+  return mapping;
+}
+
+function doLoadOriginalSources(loadContext) {
+  var uris = Object.keys(loadContext.uriToSource);
+  var uri;
+  var source;
+  var total;
+
+  for (total = uris.length; loadContext.index < total; loadContext.index++) {
+    uri = uris[loadContext.index];
+    source = loadContext.uriToSource[uri];
+
+    if (source) {
+      loadContext.sourcesContent[uri] = source;
+    } else {
+      return loadOriginalSource(uri, loadContext);
+    }
+  }
+
+  return loadContext.callback();
+}
+
+function loadOriginalSource(uri, loadContext) {
+  var content;
+
+  if (isRemoteResource(uri)) {
+    return loadOriginalSourceFromRemoteUri(uri, loadContext, function (content) {
+      loadContext.index++;
+      loadContext.sourcesContent[uri] = content;
+      return doLoadOriginalSources(loadContext);
+    });
+  } else {
+    content = loadOriginalSourceFromLocalUri(uri, loadContext);
+    loadContext.index++;
+    loadContext.sourcesContent[uri] = content;
+    return doLoadOriginalSources(loadContext);
+  }
+}
+
+function loadOriginalSourceFromRemoteUri(uri, loadContext, whenLoaded) {
+  var isAllowed = isAllowedResource(uri, true, loadContext.inline);
+  var isRuntimeResource = !hasProtocol(uri);
+
+  if (loadContext.localOnly) {
+    loadContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.');
+    return whenLoaded(null);
+  } else if (isRuntimeResource) {
+    loadContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.');
+    return whenLoaded(null);
+  } else if (!isAllowed) {
+    loadContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
+    return whenLoaded(null);
+  }
+
+  loadRemoteResource(uri, loadContext.inlineRequest, loadContext.inlineTimeout, function (error, content) {
+    if (error) {
+      loadContext.warnings.push('Missing original source at "' + uri + '" - ' + error);
+    }
+
+    whenLoaded(content);
+  });
+}
+
+function loadOriginalSourceFromLocalUri(relativeUri, loadContext) {
+  var isAllowed = isAllowedResource(relativeUri, false, loadContext.inline);
+  var absoluteUri = path.resolve(loadContext.rebaseTo, relativeUri);
+
+  if (!fs.existsSync(absoluteUri) || !fs.statSync(absoluteUri).isFile()) {
+    loadContext.warnings.push('Ignoring local source map at "' + absoluteUri + '" as resource is missing.');
+    return null;
+  } else if (!isAllowed) {
+    loadContext.warnings.push('Cannot fetch "' + absoluteUri + '" as resource is not allowed.');
+    return null;
+  }
+
+  return fs.readFileSync(absoluteUri, 'utf8');
+}
+
+module.exports = loadOriginalSources;
diff --git a/node_modules/clean-css/lib/reader/load-remote-resource.js b/node_modules/clean-css/lib/reader/load-remote-resource.js
new file mode 100644
index 000000000..0133c78bf
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/load-remote-resource.js
@@ -0,0 +1,74 @@
+var http = require('http');
+var https = require('https');
+var url = require('url');
+
+var isHttpResource = require('../utils/is-http-resource');
+var isHttpsResource = require('../utils/is-https-resource');
+var override = require('../utils/override');
+
+var HTTP_PROTOCOL = 'http:';
+
+function loadRemoteResource(uri, inlineRequest, inlineTimeout, callback) {
+  var proxyProtocol = inlineRequest.protocol || inlineRequest.hostname;
+  var errorHandled = false;
+  var requestOptions;
+  var fetch;
+
+  requestOptions = override(
+    url.parse(uri),
+    inlineRequest || {}
+  );
+
+  if (inlineRequest.hostname !== undefined) {
+    // overwrite as we always expect a http proxy currently
+    requestOptions.protocol = inlineRequest.protocol || HTTP_PROTOCOL;
+    requestOptions.path = requestOptions.href;
+  }
+
+  fetch = (proxyProtocol && !isHttpsResource(proxyProtocol)) || isHttpResource(uri) ?
+    http.get :
+    https.get;
+
+  fetch(requestOptions, function (res) {
+    var chunks = [];
+    var movedUri;
+
+    if (errorHandled) {
+      return;
+    }
+
+    if (res.statusCode < 200 || res.statusCode > 399) {
+      return callback(res.statusCode, null);
+    } else if (res.statusCode > 299) {
+      movedUri = url.resolve(uri, res.headers.location);
+      return loadRemoteResource(movedUri, inlineRequest, inlineTimeout, callback);
+    }
+
+    res.on('data', function (chunk) {
+      chunks.push(chunk.toString());
+    });
+    res.on('end', function () {
+      var body = chunks.join('');
+      callback(null, body);
+    });
+  })
+  .on('error', function (res) {
+    if (errorHandled) {
+      return;
+    }
+
+    errorHandled = true;
+    callback(res.message, null);
+  })
+  .on('timeout', function () {
+    if (errorHandled) {
+      return;
+    }
+
+    errorHandled = true;
+    callback('timeout', null);
+  })
+  .setTimeout(inlineTimeout);
+}
+
+module.exports = loadRemoteResource;
diff --git a/node_modules/clean-css/lib/reader/match-data-uri.js b/node_modules/clean-css/lib/reader/match-data-uri.js
new file mode 100644
index 000000000..d0d5a4c74
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/match-data-uri.js
@@ -0,0 +1,7 @@
+var DATA_URI_PATTERN = /^data:(\S*?)?(;charset=[^;]+)?(;[^,]+?)?,(.+)/;
+
+function matchDataUri(uri) {
+  return DATA_URI_PATTERN.exec(uri);
+}
+
+module.exports = matchDataUri;
diff --git a/node_modules/clean-css/lib/reader/normalize-path.js b/node_modules/clean-css/lib/reader/normalize-path.js
new file mode 100644
index 000000000..a9eca38cb
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/normalize-path.js
@@ -0,0 +1,8 @@
+var UNIX_SEPARATOR = '/';
+var WINDOWS_SEPARATOR_PATTERN = /\\/g;
+
+function normalizePath(path) {
+  return path.replace(WINDOWS_SEPARATOR_PATTERN, UNIX_SEPARATOR);
+}
+
+module.exports = normalizePath;
diff --git a/node_modules/clean-css/lib/reader/read-sources.js b/node_modules/clean-css/lib/reader/read-sources.js
new file mode 100644
index 000000000..e12e23514
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/read-sources.js
@@ -0,0 +1,327 @@
+var fs = require('fs');
+var path = require('path');
+
+var applySourceMaps = require('./apply-source-maps');
+var extractImportUrlAndMedia = require('./extract-import-url-and-media');
+var isAllowedResource = require('./is-allowed-resource');
+var loadOriginalSources = require('./load-original-sources');
+var loadRemoteResource = require('./load-remote-resource');
+var normalizePath = require('./normalize-path');
+var rebase = require('./rebase');
+var rebaseLocalMap = require('./rebase-local-map');
+var rebaseRemoteMap = require('./rebase-remote-map');
+var restoreImport = require('./restore-import');
+
+var tokenize = require('../tokenizer/tokenize');
+var Token = require('../tokenizer/token');
+var Marker = require('../tokenizer/marker');
+var hasProtocol = require('../utils/has-protocol');
+var isImport = require('../utils/is-import');
+var isRemoteResource = require('../utils/is-remote-resource');
+
+var UNKNOWN_URI = 'uri:unknown';
+
+function readSources(input, context, callback) {
+  return doReadSources(input, context, function (tokens) {
+    return applySourceMaps(tokens, context, function () {
+      return loadOriginalSources(context, function () { return callback(tokens); });
+    });
+  });
+}
+
+function doReadSources(input, context, callback) {
+  if (typeof input == 'string') {
+    return fromString(input, context, callback);
+  } else if (Buffer.isBuffer(input)) {
+    return fromString(input.toString(), context, callback);
+  } else if (Array.isArray(input)) {
+    return fromArray(input, context, callback);
+  } else if (typeof input == 'object') {
+    return fromHash(input, context, callback);
+  }
+}
+
+function fromString(input, context, callback) {
+  context.source = undefined;
+  context.sourcesContent[undefined] = input;
+  context.stats.originalSize += input.length;
+
+  return fromStyles(input, context, { inline: context.options.inline }, callback);
+}
+
+function fromArray(input, context, callback) {
+  var inputAsImports = input.reduce(function (accumulator, uri) {
+    var normalizedUri = normalizeUri(uri);
+
+    accumulator.push(restoreAsImport(normalizedUri));
+    return accumulator;
+  }, []);
+
+  return fromStyles(inputAsImports.join(''), context, { inline: ['all'] }, callback);
+}
+
+function fromHash(input, context, callback) {
+  var uri;
+  var normalizedUri;
+  var source;
+  var inputAsImports = [];
+
+  for (uri in input) {
+    source = input[uri];
+    normalizedUri = normalizeUri(uri);
+
+    inputAsImports.push(restoreAsImport(normalizedUri));
+
+    context.sourcesContent[normalizedUri] = source.styles;
+
+    if (source.sourceMap) {
+      trackSourceMap(source.sourceMap, normalizedUri, context);
+    }
+  }
+
+  return fromStyles(inputAsImports.join(''), context, { inline: ['all'] }, callback);
+}
+
+function normalizeUri(uri) {
+  var currentPath = path.resolve('');
+  var absoluteUri;
+  var relativeToCurrentPath;
+  var normalizedUri;
+
+  if (isRemoteResource(uri)) {
+    return uri;
+  }
+
+  absoluteUri = path.isAbsolute(uri) ?
+    uri :
+    path.resolve(uri);
+  relativeToCurrentPath = path.relative(currentPath, absoluteUri);
+  normalizedUri = normalizePath(relativeToCurrentPath);
+
+  return normalizedUri;
+}
+
+function trackSourceMap(sourceMap, uri, context) {
+  var parsedMap = typeof sourceMap == 'string' ?
+      JSON.parse(sourceMap) :
+      sourceMap;
+  var rebasedMap = isRemoteResource(uri) ?
+    rebaseRemoteMap(parsedMap, uri) :
+    rebaseLocalMap(parsedMap, uri || UNKNOWN_URI, context.options.rebaseTo);
+
+  context.inputSourceMapTracker.track(uri, rebasedMap);
+}
+
+function restoreAsImport(uri) {
+  return restoreImport('url(' + uri + ')', '') + Marker.SEMICOLON;
+}
+
+function fromStyles(styles, context, parentInlinerContext, callback) {
+  var tokens;
+  var rebaseConfig = {};
+
+  if (!context.source) {
+    rebaseConfig.fromBase = path.resolve('');
+    rebaseConfig.toBase = context.options.rebaseTo;
+  } else if (isRemoteResource(context.source)) {
+    rebaseConfig.fromBase = context.source;
+    rebaseConfig.toBase = context.source;
+  } else if (path.isAbsolute(context.source)) {
+    rebaseConfig.fromBase = path.dirname(context.source);
+    rebaseConfig.toBase = context.options.rebaseTo;
+  } else {
+    rebaseConfig.fromBase = path.dirname(path.resolve(context.source));
+    rebaseConfig.toBase = context.options.rebaseTo;
+  }
+
+  tokens = tokenize(styles, context);
+  tokens = rebase(tokens, context.options.rebase, context.validator, rebaseConfig);
+
+  return allowsAnyImports(parentInlinerContext.inline) ?
+    inline(tokens, context, parentInlinerContext, callback) :
+    callback(tokens);
+}
+
+function allowsAnyImports(inline) {
+  return !(inline.length == 1 && inline[0] == 'none');
+}
+
+function inline(tokens, externalContext, parentInlinerContext, callback) {
+  var inlinerContext = {
+    afterContent: false,
+    callback: callback,
+    errors: externalContext.errors,
+    externalContext: externalContext,
+    inlinedStylesheets: parentInlinerContext.inlinedStylesheets || externalContext.inlinedStylesheets,
+    inline: parentInlinerContext.inline,
+    inlineRequest: externalContext.options.inlineRequest,
+    inlineTimeout: externalContext.options.inlineTimeout,
+    isRemote: parentInlinerContext.isRemote || false,
+    localOnly: externalContext.localOnly,
+    outputTokens: [],
+    rebaseTo: externalContext.options.rebaseTo,
+    sourceTokens: tokens,
+    warnings: externalContext.warnings
+  };
+
+  return doInlineImports(inlinerContext);
+}
+
+function doInlineImports(inlinerContext) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = inlinerContext.sourceTokens.length; i < l; i++) {
+    token = inlinerContext.sourceTokens[i];
+
+    if (token[0] == Token.AT_RULE && isImport(token[1])) {
+      inlinerContext.sourceTokens.splice(0, i);
+      return inlineStylesheet(token, inlinerContext);
+    } else if (token[0] == Token.AT_RULE || token[0] == Token.COMMENT) {
+      inlinerContext.outputTokens.push(token);
+    } else {
+      inlinerContext.outputTokens.push(token);
+      inlinerContext.afterContent = true;
+    }
+  }
+
+  inlinerContext.sourceTokens = [];
+  return inlinerContext.callback(inlinerContext.outputTokens);
+}
+
+function inlineStylesheet(token, inlinerContext) {
+  var uriAndMediaQuery = extractImportUrlAndMedia(token[1]);
+  var uri = uriAndMediaQuery[0];
+  var mediaQuery = uriAndMediaQuery[1];
+  var metadata = token[2];
+
+  return isRemoteResource(uri) ?
+    inlineRemoteStylesheet(uri, mediaQuery, metadata, inlinerContext) :
+    inlineLocalStylesheet(uri, mediaQuery, metadata, inlinerContext);
+}
+
+function inlineRemoteStylesheet(uri, mediaQuery, metadata, inlinerContext) {
+  var isAllowed = isAllowedResource(uri, true, inlinerContext.inline);
+  var originalUri = uri;
+  var isLoaded = uri in inlinerContext.externalContext.sourcesContent;
+  var isRuntimeResource = !hasProtocol(uri);
+
+  if (inlinerContext.inlinedStylesheets.indexOf(uri) > -1) {
+    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as it has already been imported.');
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } else if (inlinerContext.localOnly && inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as no callback given and after other content.');
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } else if (isRuntimeResource) {
+    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as no protocol given.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } else if (inlinerContext.localOnly && !isLoaded) {
+    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as no callback given.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } else if (!isAllowed && inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring remote @import of "' + uri + '" as resource is not allowed and after other content.');
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  } else if (!isAllowed) {
+    inlinerContext.warnings.push('Skipping remote @import of "' + uri + '" as resource is not allowed.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+    inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+    return doInlineImports(inlinerContext);
+  }
+
+  inlinerContext.inlinedStylesheets.push(uri);
+
+  function whenLoaded(error, importedStyles) {
+    if (error) {
+      inlinerContext.errors.push('Broken @import declaration of "' + uri + '" - ' + error);
+
+      return process.nextTick(function () {
+        inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+        inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+        doInlineImports(inlinerContext);
+      });
+    }
+
+    inlinerContext.inline = inlinerContext.externalContext.options.inline;
+    inlinerContext.isRemote = true;
+
+    inlinerContext.externalContext.source = originalUri;
+    inlinerContext.externalContext.sourcesContent[uri] = importedStyles;
+    inlinerContext.externalContext.stats.originalSize += importedStyles.length;
+
+    return fromStyles(importedStyles, inlinerContext.externalContext, inlinerContext, function (importedTokens) {
+      importedTokens = wrapInMedia(importedTokens, mediaQuery, metadata);
+
+      inlinerContext.outputTokens = inlinerContext.outputTokens.concat(importedTokens);
+      inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+
+      return doInlineImports(inlinerContext);
+    });
+  }
+
+  return isLoaded ?
+    whenLoaded(null, inlinerContext.externalContext.sourcesContent[uri]) :
+    loadRemoteResource(uri, inlinerContext.inlineRequest, inlinerContext.inlineTimeout, whenLoaded);
+}
+
+function inlineLocalStylesheet(uri, mediaQuery, metadata, inlinerContext) {
+  var currentPath = path.resolve('');
+  var absoluteUri = path.isAbsolute(uri) ?
+    path.resolve(currentPath, uri[0] == '/' ? uri.substring(1) : uri) :
+    path.resolve(inlinerContext.rebaseTo, uri);
+  var relativeToCurrentPath = path.relative(currentPath, absoluteUri);
+  var importedStyles;
+  var importedTokens;
+  var isAllowed = isAllowedResource(uri, false, inlinerContext.inline);
+  var normalizedPath = normalizePath(relativeToCurrentPath);
+  var isLoaded = normalizedPath in inlinerContext.externalContext.sourcesContent;
+
+  if (inlinerContext.inlinedStylesheets.indexOf(absoluteUri) > -1) {
+    inlinerContext.warnings.push('Ignoring local @import of "' + uri + '" as it has already been imported.');
+  } else if (!isLoaded && (!fs.existsSync(absoluteUri) || !fs.statSync(absoluteUri).isFile())) {
+    inlinerContext.errors.push('Ignoring local @import of "' + uri + '" as resource is missing.');
+  } else if (!isAllowed && inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring local @import of "' + uri + '" as resource is not allowed and after other content.');
+  } else if (inlinerContext.afterContent) {
+    inlinerContext.warnings.push('Ignoring local @import of "' + uri + '" as after other content.');
+  } else if (!isAllowed) {
+    inlinerContext.warnings.push('Skipping local @import of "' + uri + '" as resource is not allowed.');
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(inlinerContext.sourceTokens.slice(0, 1));
+  } else {
+    importedStyles = isLoaded ?
+      inlinerContext.externalContext.sourcesContent[normalizedPath] :
+      fs.readFileSync(absoluteUri, 'utf-8');
+
+    inlinerContext.inlinedStylesheets.push(absoluteUri);
+    inlinerContext.inline = inlinerContext.externalContext.options.inline;
+
+    inlinerContext.externalContext.source = normalizedPath;
+    inlinerContext.externalContext.sourcesContent[normalizedPath] = importedStyles;
+    inlinerContext.externalContext.stats.originalSize += importedStyles.length;
+
+    importedTokens = fromStyles(importedStyles, inlinerContext.externalContext, inlinerContext, function (tokens) { return tokens; });
+    importedTokens = wrapInMedia(importedTokens, mediaQuery, metadata);
+
+    inlinerContext.outputTokens = inlinerContext.outputTokens.concat(importedTokens);
+  }
+
+  inlinerContext.sourceTokens = inlinerContext.sourceTokens.slice(1);
+
+  return doInlineImports(inlinerContext);
+}
+
+function wrapInMedia(tokens, mediaQuery, metadata) {
+  if (mediaQuery) {
+    return [[Token.NESTED_BLOCK, [[Token.NESTED_BLOCK_SCOPE, '@media ' + mediaQuery, metadata]], tokens]];
+  } else {
+    return tokens;
+  }
+}
+
+module.exports = readSources;
diff --git a/node_modules/clean-css/lib/reader/rebase-local-map.js b/node_modules/clean-css/lib/reader/rebase-local-map.js
new file mode 100644
index 000000000..aec8d2324
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/rebase-local-map.js
@@ -0,0 +1,15 @@
+var path = require('path');
+
+function rebaseLocalMap(sourceMap, sourceUri, rebaseTo) {
+  var currentPath = path.resolve('');
+  var absoluteUri = path.resolve(currentPath, sourceUri);
+  var absoluteUriDirectory = path.dirname(absoluteUri);
+
+  sourceMap.sources = sourceMap.sources.map(function(source) {
+    return path.relative(rebaseTo, path.resolve(absoluteUriDirectory, source));
+  });
+
+  return sourceMap;
+}
+
+module.exports = rebaseLocalMap;
diff --git a/node_modules/clean-css/lib/reader/rebase-remote-map.js b/node_modules/clean-css/lib/reader/rebase-remote-map.js
new file mode 100644
index 000000000..7b6bb7ac9
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/rebase-remote-map.js
@@ -0,0 +1,14 @@
+var path = require('path');
+var url = require('url');
+
+function rebaseRemoteMap(sourceMap, sourceUri) {
+  var sourceDirectory = path.dirname(sourceUri);
+
+  sourceMap.sources = sourceMap.sources.map(function(source) {
+    return url.resolve(sourceDirectory, source);
+  });
+
+  return sourceMap;
+}
+
+module.exports = rebaseRemoteMap;
diff --git a/node_modules/clean-css/lib/reader/rebase.js b/node_modules/clean-css/lib/reader/rebase.js
new file mode 100644
index 000000000..4e0ff9751
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/rebase.js
@@ -0,0 +1,101 @@
+var extractImportUrlAndMedia = require('./extract-import-url-and-media');
+var restoreImport = require('./restore-import');
+var rewriteUrl = require('./rewrite-url');
+
+var Token = require('../tokenizer/token');
+var isImport = require('../utils/is-import');
+
+var SOURCE_MAP_COMMENT_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/;
+
+function rebase(tokens, rebaseAll, validator, rebaseConfig) {
+  return rebaseAll ?
+    rebaseEverything(tokens, validator, rebaseConfig) :
+    rebaseAtRules(tokens, validator, rebaseConfig);
+}
+
+function rebaseEverything(tokens, validator, rebaseConfig) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    switch (token[0]) {
+      case Token.AT_RULE:
+        rebaseAtRule(token, validator, rebaseConfig);
+        break;
+      case Token.AT_RULE_BLOCK:
+        rebaseProperties(token[2], validator, rebaseConfig);
+        break;
+      case Token.COMMENT:
+        rebaseSourceMapComment(token, rebaseConfig);
+        break;
+      case Token.NESTED_BLOCK:
+        rebaseEverything(token[2], validator, rebaseConfig);
+        break;
+      case Token.RULE:
+        rebaseProperties(token[2], validator, rebaseConfig);
+        break;
+    }
+  }
+
+  return tokens;
+}
+
+function rebaseAtRules(tokens, validator, rebaseConfig) {
+  var token;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+
+    switch (token[0]) {
+      case Token.AT_RULE:
+        rebaseAtRule(token, validator, rebaseConfig);
+        break;
+    }
+  }
+
+  return tokens;
+}
+
+function rebaseAtRule(token, validator, rebaseConfig) {
+  if (!isImport(token[1])) {
+    return;
+  }
+
+  var uriAndMediaQuery = extractImportUrlAndMedia(token[1]);
+  var newUrl = rewriteUrl(uriAndMediaQuery[0], rebaseConfig);
+  var mediaQuery = uriAndMediaQuery[1];
+
+  token[1] = restoreImport(newUrl, mediaQuery);
+}
+
+function rebaseSourceMapComment(token, rebaseConfig) {
+  var matches = SOURCE_MAP_COMMENT_PATTERN.exec(token[1]);
+
+  if (matches && matches[1].indexOf('data:') === -1) {
+    token[1] = token[1].replace(matches[1], rewriteUrl(matches[1], rebaseConfig, true));
+  }
+}
+
+function rebaseProperties(properties, validator, rebaseConfig) {
+  var property;
+  var value;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = properties.length; i < l; i++) {
+    property = properties[i];
+
+    for (j = 2 /* 0 is Token.PROPERTY, 1 is name */, m = property.length; j < m; j++) {
+      value = property[j][1];
+
+      if (validator.isValidUrl(value)) {
+        property[j][1] = rewriteUrl(value, rebaseConfig);
+      }
+    }
+  }
+}
+
+module.exports = rebase;
diff --git a/node_modules/clean-css/lib/reader/restore-import.js b/node_modules/clean-css/lib/reader/restore-import.js
new file mode 100644
index 000000000..5bdbd92c8
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/restore-import.js
@@ -0,0 +1,5 @@
+function restoreImport(uri, mediaQuery) {
+  return ('@import ' + uri + ' ' + mediaQuery).trim();
+}
+
+module.exports = restoreImport;
diff --git a/node_modules/clean-css/lib/reader/rewrite-url.js b/node_modules/clean-css/lib/reader/rewrite-url.js
new file mode 100644
index 000000000..a4793fd1c
--- /dev/null
+++ b/node_modules/clean-css/lib/reader/rewrite-url.js
@@ -0,0 +1,118 @@
+var path = require('path');
+var url = require('url');
+
+var DOUBLE_QUOTE = '"';
+var SINGLE_QUOTE = '\'';
+var URL_PREFIX = 'url(';
+var URL_SUFFIX = ')';
+
+var QUOTE_PREFIX_PATTERN = /^["']/;
+var QUOTE_SUFFIX_PATTERN = /["']$/;
+var ROUND_BRACKETS_PATTERN = /[\(\)]/;
+var URL_PREFIX_PATTERN = /^url\(/i;
+var URL_SUFFIX_PATTERN = /\)$/;
+var WHITESPACE_PATTERN = /\s/;
+
+var isWindows = process.platform == 'win32';
+
+function rebase(uri, rebaseConfig) {
+  if (!rebaseConfig) {
+    return uri;
+  }
+
+  if (isAbsolute(uri) && !isRemote(rebaseConfig.toBase)) {
+    return uri;
+  }
+
+  if (isRemote(uri) || isSVGMarker(uri) || isInternal(uri)) {
+    return uri;
+  }
+
+  if (isData(uri)) {
+    return '\'' + uri + '\'';
+  }
+
+  if (isRemote(rebaseConfig.toBase)) {
+    return url.resolve(rebaseConfig.toBase, uri);
+  }
+
+  return rebaseConfig.absolute ?
+    normalize(absolute(uri, rebaseConfig)) :
+    normalize(relative(uri, rebaseConfig));
+}
+
+function isAbsolute(uri) {
+  return path.isAbsolute(uri);
+}
+
+function isSVGMarker(uri) {
+  return uri[0] == '#';
+}
+
+function isInternal(uri) {
+  return /^\w+:\w+/.test(uri);
+}
+
+function isRemote(uri) {
+  return /^[^:]+?:\/\//.test(uri) || uri.indexOf('//') === 0;
+}
+
+function isData(uri) {
+  return uri.indexOf('data:') === 0;
+}
+
+function absolute(uri, rebaseConfig) {
+  return path
+    .resolve(path.join(rebaseConfig.fromBase || '', uri))
+    .replace(rebaseConfig.toBase, '');
+}
+
+function relative(uri, rebaseConfig) {
+  return path.relative(rebaseConfig.toBase, path.join(rebaseConfig.fromBase || '', uri));
+}
+
+function normalize(uri) {
+  return isWindows ? uri.replace(/\\/g, '/') : uri;
+}
+
+function quoteFor(unquotedUrl) {
+  if (unquotedUrl.indexOf(SINGLE_QUOTE) > -1) {
+    return DOUBLE_QUOTE;
+  } else if (unquotedUrl.indexOf(DOUBLE_QUOTE) > -1) {
+    return SINGLE_QUOTE;
+  } else if (hasWhitespace(unquotedUrl) || hasRoundBrackets(unquotedUrl)) {
+    return SINGLE_QUOTE;
+  } else {
+    return '';
+  }
+}
+
+function hasWhitespace(url) {
+  return WHITESPACE_PATTERN.test(url);
+}
+
+function hasRoundBrackets(url) {
+  return ROUND_BRACKETS_PATTERN.test(url);
+}
+
+function rewriteUrl(originalUrl, rebaseConfig, pathOnly) {
+  var strippedUrl = originalUrl
+    .replace(URL_PREFIX_PATTERN, '')
+    .replace(URL_SUFFIX_PATTERN, '')
+    .trim();
+
+  var unquotedUrl = strippedUrl
+    .replace(QUOTE_PREFIX_PATTERN, '')
+    .replace(QUOTE_SUFFIX_PATTERN, '')
+    .trim();
+
+  var quote = strippedUrl[0] == SINGLE_QUOTE || strippedUrl[0] == DOUBLE_QUOTE ?
+    strippedUrl[0] :
+    quoteFor(unquotedUrl);
+
+  return pathOnly ?
+    rebase(unquotedUrl, rebaseConfig) :
+    URL_PREFIX + quote + rebase(unquotedUrl, rebaseConfig) + quote + URL_SUFFIX;
+}
+
+module.exports = rewriteUrl;
diff --git a/node_modules/clean-css/lib/tokenizer/marker.js b/node_modules/clean-css/lib/tokenizer/marker.js
new file mode 100644
index 000000000..c3f6805a7
--- /dev/null
+++ b/node_modules/clean-css/lib/tokenizer/marker.js
@@ -0,0 +1,25 @@
+var Marker = {
+  ASTERISK: '*',
+  AT: '@',
+  BACK_SLASH: '\\',
+  CLOSE_CURLY_BRACKET: '}',
+  CLOSE_ROUND_BRACKET: ')',
+  CLOSE_SQUARE_BRACKET: ']',
+  COLON: ':',
+  COMMA: ',',
+  DOUBLE_QUOTE: '"',
+  EXCLAMATION: '!',
+  FORWARD_SLASH: '/',
+  NEW_LINE_NIX: '\n',
+  NEW_LINE_WIN: '\r',
+  OPEN_CURLY_BRACKET: '{',
+  OPEN_ROUND_BRACKET: '(',
+  OPEN_SQUARE_BRACKET: '[',
+  SEMICOLON: ';',
+  SINGLE_QUOTE: '\'',
+  SPACE: ' ',
+  TAB: '\t',
+  UNDERSCORE: '_'
+};
+
+module.exports = Marker;
diff --git a/node_modules/clean-css/lib/tokenizer/token.js b/node_modules/clean-css/lib/tokenizer/token.js
new file mode 100644
index 000000000..acd0154ee
--- /dev/null
+++ b/node_modules/clean-css/lib/tokenizer/token.js
@@ -0,0 +1,16 @@
+var Token = {
+  AT_RULE: 'at-rule', // e.g. `@import`, `@charset`
+  AT_RULE_BLOCK: 'at-rule-block', // e.g. `@font-face{...}`
+  AT_RULE_BLOCK_SCOPE: 'at-rule-block-scope', // e.g. `@font-face`
+  COMMENT: 'comment', // e.g. `/* comment */`
+  NESTED_BLOCK: 'nested-block', // e.g. `@media screen{...}`, `@keyframes animation {...}`
+  NESTED_BLOCK_SCOPE: 'nested-block-scope', // e.g. `@media`, `@keyframes`
+  PROPERTY: 'property', // e.g. `color:red`
+  PROPERTY_BLOCK: 'property-block', // e.g. `--var:{color:red}`
+  PROPERTY_NAME: 'property-name', // e.g. `color`
+  PROPERTY_VALUE: 'property-value', // e.g. `red`
+  RULE: 'rule', // e.g `div > a{...}`
+  RULE_SCOPE: 'rule-scope' // e.g `div > a`
+};
+
+module.exports = Token;
diff --git a/node_modules/clean-css/lib/tokenizer/tokenize.js b/node_modules/clean-css/lib/tokenizer/tokenize.js
new file mode 100644
index 000000000..15fb584a0
--- /dev/null
+++ b/node_modules/clean-css/lib/tokenizer/tokenize.js
@@ -0,0 +1,463 @@
+var Marker = require('./marker');
+var Token = require('./token');
+
+var formatPosition = require('../utils/format-position');
+
+var Level = {
+  BLOCK: 'block',
+  COMMENT: 'comment',
+  DOUBLE_QUOTE: 'double-quote',
+  RULE: 'rule',
+  SINGLE_QUOTE: 'single-quote'
+};
+
+var AT_RULES = [
+  '@charset',
+  '@import'
+];
+
+var BLOCK_RULES = [
+  '@-moz-document',
+  '@document',
+  '@-moz-keyframes',
+  '@-ms-keyframes',
+  '@-o-keyframes',
+  '@-webkit-keyframes',
+  '@keyframes',
+  '@media',
+  '@supports'
+];
+
+var RULE_WORD_SEPARATOR_PATTERN = /[\s\(]/;
+var TAIL_BROKEN_VALUE_PATTERN = /[\s|\}]*$/;
+
+function tokenize(source, externalContext) {
+  var internalContext = {
+    level: Level.BLOCK,
+    position: {
+      source: externalContext.source || undefined,
+      line: 1,
+      column: 0,
+      index: 0
+    }
+  };
+
+  return intoTokens(source, externalContext, internalContext, false);
+}
+
+function intoTokens(source, externalContext, internalContext, isNested) {
+  var allTokens = [];
+  var newTokens = allTokens;
+  var lastToken;
+  var ruleToken;
+  var ruleTokens = [];
+  var propertyToken;
+  var metadata;
+  var metadatas = [];
+  var level = internalContext.level;
+  var levels = [];
+  var buffer = [];
+  var buffers = [];
+  var serializedBuffer;
+  var roundBracketLevel = 0;
+  var isQuoted;
+  var isSpace;
+  var isNewLineNix;
+  var isNewLineWin;
+  var isCommentStart;
+  var wasCommentStart = false;
+  var isCommentEnd;
+  var wasCommentEnd = false;
+  var isEscaped;
+  var wasEscaped = false;
+  var seekingValue = false;
+  var seekingPropertyBlockClosing = false;
+  var position = internalContext.position;
+
+  for (; position.index < source.length; position.index++) {
+    var character = source[position.index];
+
+    isQuoted = level == Level.SINGLE_QUOTE || level == Level.DOUBLE_QUOTE;
+    isSpace = character == Marker.SPACE || character == Marker.TAB;
+    isNewLineNix = character == Marker.NEW_LINE_NIX;
+    isNewLineWin = character == Marker.NEW_LINE_NIX && source[position.index - 1] == Marker.NEW_LINE_WIN;
+    isCommentStart = !wasCommentEnd && level != Level.COMMENT && !isQuoted && character == Marker.ASTERISK && source[position.index - 1] == Marker.FORWARD_SLASH;
+    isCommentEnd = !wasCommentStart && level == Level.COMMENT && character == Marker.FORWARD_SLASH && source[position.index - 1] == Marker.ASTERISK;
+
+    metadata = buffer.length === 0 ?
+      [position.line, position.column, position.source] :
+      metadata;
+
+    if (isEscaped) {
+      // previous character was a backslash
+      buffer.push(character);
+    } else if (!isCommentEnd && level == Level.COMMENT) {
+      buffer.push(character);
+    } else if (isCommentStart && (level == Level.BLOCK || level == Level.RULE) && buffer.length > 1) {
+      // comment start within block preceded by some content, e.g. div/*<--
+      metadatas.push(metadata);
+      buffer.push(character);
+      buffers.push(buffer.slice(0, buffer.length - 2));
+
+      buffer = buffer.slice(buffer.length - 2);
+      metadata = [position.line, position.column - 1, position.source];
+
+      levels.push(level);
+      level = Level.COMMENT;
+    } else if (isCommentStart) {
+      // comment start, e.g. /*<--
+      levels.push(level);
+      level = Level.COMMENT;
+      buffer.push(character);
+    } else if (isCommentEnd) {
+      // comment end, e.g. /* comment */<--
+      serializedBuffer = buffer.join('').trim() + character;
+      lastToken = [Token.COMMENT, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]];
+      newTokens.push(lastToken);
+
+      level = levels.pop();
+      metadata = metadatas.pop() || null;
+      buffer = buffers.pop() || [];
+    } else if (character == Marker.SINGLE_QUOTE && !isQuoted) {
+      // single quotation start, e.g. a[href^='https<--
+      levels.push(level);
+      level = Level.SINGLE_QUOTE;
+      buffer.push(character);
+    } else if (character == Marker.SINGLE_QUOTE && level == Level.SINGLE_QUOTE) {
+      // single quotation end, e.g. a[href^='https'<--
+      level = levels.pop();
+      buffer.push(character);
+    } else if (character == Marker.DOUBLE_QUOTE && !isQuoted) {
+      // double quotation start, e.g. a[href^="<--
+      levels.push(level);
+      level = Level.DOUBLE_QUOTE;
+      buffer.push(character);
+    } else if (character == Marker.DOUBLE_QUOTE && level == Level.DOUBLE_QUOTE) {
+      // double quotation end, e.g. a[href^="https"<--
+      level = levels.pop();
+      buffer.push(character);
+    } else if (!isCommentStart && !isCommentEnd && character != Marker.CLOSE_ROUND_BRACKET && character != Marker.OPEN_ROUND_BRACKET && level != Level.COMMENT && !isQuoted && roundBracketLevel > 0) {
+      // character inside any function, e.g. hsla(.<--
+      buffer.push(character);
+    } else if (character == Marker.OPEN_ROUND_BRACKET && !isQuoted && level != Level.COMMENT && !seekingValue) {
+      // round open bracket, e.g. @import url(<--
+      buffer.push(character);
+
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && !isQuoted && level != Level.COMMENT && !seekingValue) {
+      // round open bracket, e.g. @import url(test.css)<--
+      buffer.push(character);
+
+      roundBracketLevel--;
+    } else if (character == Marker.SEMICOLON && level == Level.BLOCK && buffer[0] == Marker.AT) {
+      // semicolon ending rule at block level, e.g. @import '...';<--
+      serializedBuffer = buffer.join('').trim();
+      allTokens.push([Token.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+      buffer = [];
+    } else if (character == Marker.COMMA && level == Level.BLOCK && ruleToken) {
+      // comma separator at block level, e.g. a,div,<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([tokenScopeFrom(ruleToken[0]), serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext, ruleToken[1].length)]]);
+
+      buffer = [];
+    } else if (character == Marker.COMMA && level == Level.BLOCK && tokenTypeFrom(buffer) == Token.AT_RULE) {
+      // comma separator at block level, e.g. @import url(...) screen,<--
+      // keep iterating as end semicolon will create the token
+      buffer.push(character);
+    } else if (character == Marker.COMMA && level == Level.BLOCK) {
+      // comma separator at block level, e.g. a,<--
+      ruleToken = [tokenTypeFrom(buffer), [], []];
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([tokenScopeFrom(ruleToken[0]), serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext, 0)]]);
+
+      buffer = [];
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.BLOCK && ruleToken && ruleToken[0] == Token.NESTED_BLOCK) {
+      // open brace opening at-rule at block level, e.g. @media{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([Token.NESTED_BLOCK_SCOPE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      allTokens.push(ruleToken);
+
+      levels.push(level);
+      position.column++;
+      position.index++;
+      buffer = [];
+
+      ruleToken[2] = intoTokens(source, externalContext, internalContext, true);
+      ruleToken = null;
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.BLOCK && tokenTypeFrom(buffer) == Token.NESTED_BLOCK) {
+      // open brace opening at-rule at block level, e.g. @media{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken = ruleToken || [Token.NESTED_BLOCK, [], []];
+      ruleToken[1].push([Token.NESTED_BLOCK_SCOPE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      allTokens.push(ruleToken);
+
+      levels.push(level);
+      position.column++;
+      position.index++;
+      buffer = [];
+
+      ruleToken[2] = intoTokens(source, externalContext, internalContext, true);
+      ruleToken = null;
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.BLOCK) {
+      // open brace opening rule at block level, e.g. div{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken = ruleToken || [tokenTypeFrom(buffer), [], []];
+      ruleToken[1].push([tokenScopeFrom(ruleToken[0]), serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext, ruleToken[1].length)]]);
+      newTokens = ruleToken[2];
+      allTokens.push(ruleToken);
+
+      levels.push(level);
+      level = Level.RULE;
+      buffer = [];
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.RULE && seekingValue) {
+      // open brace opening rule at rule level, e.g. div{--variable:{<--
+      ruleTokens.push(ruleToken);
+      ruleToken = [Token.PROPERTY_BLOCK, []];
+      propertyToken.push(ruleToken);
+      newTokens = ruleToken[1];
+
+      levels.push(level);
+      level = Level.RULE;
+      seekingValue = false;
+    } else if (character == Marker.COLON && level == Level.RULE && !seekingValue) {
+      // colon at rule level, e.g. a{color:<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken = [Token.PROPERTY, [Token.PROPERTY_NAME, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]];
+      newTokens.push(propertyToken);
+
+      seekingValue = true;
+      buffer = [];
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && propertyToken && ruleTokens.length > 0 && buffer.length > 0 && buffer[0] == Marker.AT) {
+      // semicolon at rule level for at-rule, e.g. a{--color:{@apply(--other-color);<--
+      serializedBuffer = buffer.join('').trim();
+      ruleToken[1].push([Token.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+      buffer = [];
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && propertyToken && buffer.length > 0) {
+      // semicolon at rule level, e.g. a{color:red;<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+      propertyToken = null;
+      seekingValue = false;
+      buffer = [];
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && propertyToken && buffer.length === 0) {
+      // semicolon after bracketed value at rule level, e.g. a{color:rgb(...);<--
+      propertyToken = null;
+      seekingValue = false;
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && buffer.length > 0 && buffer[0] == Marker.AT) {
+      // semicolon for at-rule at rule level, e.g. a{@apply(--variable);<--
+      serializedBuffer = buffer.join('');
+      newTokens.push([Token.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+      seekingValue = false;
+      buffer = [];
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && seekingPropertyBlockClosing) {
+      // close brace after a property block at rule level, e.g. a{--custom:{color:red;};<--
+      seekingPropertyBlockClosing = false;
+      buffer = [];
+    } else if (character == Marker.SEMICOLON && level == Level.RULE && buffer.length === 0) {
+      // stray semicolon at rule level, e.g. a{;<--
+      // noop
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && seekingValue && buffer.length > 0 && ruleTokens.length > 0) {
+      // close brace at rule level, e.g. a{--color:{color:red}<--
+      serializedBuffer = buffer.join('');
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && buffer.length > 0 && buffer[0] == Marker.AT && ruleTokens.length > 0) {
+      // close brace at rule level for at-rule, e.g. a{--color:{@apply(--other-color)}<--
+      serializedBuffer = buffer.join('');
+      ruleToken[1].push([Token.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && ruleTokens.length > 0) {
+      // close brace at rule level after space, e.g. a{--color:{color:red }<--
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE && propertyToken && buffer.length > 0) {
+      // close brace at rule level, e.g. a{color:red}<--
+      serializedBuffer = buffer.join('');
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = allTokens;
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE && buffer.length > 0 && buffer[0] == Marker.AT) {
+      // close brace after at-rule at rule level, e.g. a{@apply(--variable)}<--
+      propertyToken = null;
+      ruleToken = null;
+      serializedBuffer = buffer.join('').trim();
+      newTokens.push([Token.AT_RULE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      newTokens = allTokens;
+
+      level = levels.pop();
+      seekingValue = false;
+      buffer = [];
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE && levels[levels.length - 1] == Level.RULE) {
+      // close brace after a property block at rule level, e.g. a{--custom:{color:red;}<--
+      propertyToken = null;
+      ruleToken = ruleTokens.pop();
+      newTokens = ruleToken[2];
+
+      level = levels.pop();
+      seekingValue = false;
+      seekingPropertyBlockClosing = true;
+      buffer = [];
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.RULE) {
+      // close brace after a rule, e.g. a{color:red;}<--
+      propertyToken = null;
+      ruleToken = null;
+      newTokens = allTokens;
+
+      level = levels.pop();
+      seekingValue = false;
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.BLOCK && !isNested && position.index <= source.length - 1) {
+      // stray close brace at block level, e.g. a{color:red}color:blue}<--
+      externalContext.warnings.push('Unexpected \'}\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
+      buffer.push(character);
+    } else if (character == Marker.CLOSE_CURLY_BRACKET && level == Level.BLOCK) {
+      // close brace at block level, e.g. @media screen {...}<--
+      break;
+    } else if (character == Marker.OPEN_ROUND_BRACKET && level == Level.RULE && seekingValue) {
+      // round open bracket, e.g. a{color:hsla(<--
+      buffer.push(character);
+      roundBracketLevel++;
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && level == Level.RULE && seekingValue && roundBracketLevel == 1) {
+      // round close bracket, e.g. a{color:hsla(0,0%,0%)<--
+      buffer.push(character);
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+      roundBracketLevel--;
+      buffer = [];
+    } else if (character == Marker.CLOSE_ROUND_BRACKET && level == Level.RULE && seekingValue) {
+      // round close bracket within other brackets, e.g. a{width:calc((10rem / 2)<--
+      buffer.push(character);
+      roundBracketLevel--;
+    } else if (character == Marker.FORWARD_SLASH && source[position.index + 1] != Marker.ASTERISK && level == Level.RULE && seekingValue && buffer.length > 0) {
+      // forward slash within a property, e.g. a{background:url(image.png) 0 0/<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      propertyToken.push([Token.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);
+
+      buffer = [];
+    } else if (character == Marker.FORWARD_SLASH && source[position.index + 1] != Marker.ASTERISK && level == Level.RULE && seekingValue) {
+      // forward slash within a property after space, e.g. a{background:url(image.png) 0 0 /<--
+      propertyToken.push([Token.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);
+
+      buffer = [];
+    } else if (character == Marker.COMMA && level == Level.RULE && seekingValue && buffer.length > 0) {
+      // comma within a property, e.g. a{background:url(image.png),<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      propertyToken.push([Token.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);
+
+      buffer = [];
+    } else if (character == Marker.COMMA && level == Level.RULE && seekingValue) {
+      // comma within a property after space, e.g. a{background:url(image.png) ,<--
+      propertyToken.push([Token.PROPERTY_VALUE, character, [[position.line, position.column, position.source]]]);
+
+      buffer = [];
+    } else if ((isSpace || (isNewLineNix && !isNewLineWin)) && level == Level.RULE && seekingValue && propertyToken && buffer.length > 0) {
+      // space or *nix newline within property, e.g. a{margin:0 <--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+      buffer = [];
+    } else if (isNewLineWin && level == Level.RULE && seekingValue && propertyToken && buffer.length > 1) {
+      // win newline within property, e.g. a{margin:0\r\n<--
+      serializedBuffer = buffer.join('').trim();
+      propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+      buffer = [];
+    } else if (isNewLineWin && level == Level.RULE && seekingValue) {
+      // win newline
+      buffer = [];
+    } else if (buffer.length == 1 && isNewLineWin) {
+      // ignore windows newline which is composed of two characters
+      buffer.pop();
+    } else if (buffer.length > 0 || !isSpace && !isNewLineNix && !isNewLineWin) {
+      // any character
+      buffer.push(character);
+    }
+
+    wasEscaped = isEscaped;
+    isEscaped = !wasEscaped && character == Marker.BACK_SLASH;
+    wasCommentStart = isCommentStart;
+    wasCommentEnd = isCommentEnd;
+
+    position.line = (isNewLineWin || isNewLineNix) ? position.line + 1 : position.line;
+    position.column = (isNewLineWin || isNewLineNix) ? 0 : position.column + 1;
+  }
+
+  if (seekingValue) {
+    externalContext.warnings.push('Missing \'}\' at ' + formatPosition([position.line, position.column, position.source]) + '.');
+  }
+
+  if (seekingValue && buffer.length > 0) {
+    serializedBuffer = buffer.join('').replace(TAIL_BROKEN_VALUE_PATTERN, '');
+    propertyToken.push([Token.PROPERTY_VALUE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+
+    buffer = [];
+  }
+
+  if (buffer.length > 0) {
+    externalContext.warnings.push('Invalid character(s) \'' + buffer.join('') + '\' at ' + formatPosition(metadata) + '. Ignoring.');
+  }
+
+  return allTokens;
+}
+
+function originalMetadata(metadata, value, externalContext, selectorFallbacks) {
+  var source = metadata[2];
+
+  return externalContext.inputSourceMapTracker.isTracking(source) ?
+    externalContext.inputSourceMapTracker.originalPositionFor(metadata, value.length, selectorFallbacks) :
+    metadata;
+}
+
+function tokenTypeFrom(buffer) {
+  var isAtRule = buffer[0] == Marker.AT || buffer[0] == Marker.UNDERSCORE;
+  var ruleWord = buffer.join('').split(RULE_WORD_SEPARATOR_PATTERN)[0];
+
+  if (isAtRule && BLOCK_RULES.indexOf(ruleWord) > -1) {
+    return Token.NESTED_BLOCK;
+  } else if (isAtRule && AT_RULES.indexOf(ruleWord) > -1) {
+    return Token.AT_RULE;
+  } else if (isAtRule) {
+    return Token.AT_RULE_BLOCK;
+  } else {
+    return Token.RULE;
+  }
+}
+
+function tokenScopeFrom(tokenType) {
+  if (tokenType == Token.RULE) {
+    return Token.RULE_SCOPE;
+  } else if (tokenType == Token.NESTED_BLOCK) {
+    return Token.NESTED_BLOCK_SCOPE;
+  } else if (tokenType == Token.AT_RULE_BLOCK) {
+    return Token.AT_RULE_BLOCK_SCOPE;
+  }
+}
+
+module.exports = tokenize;
diff --git a/node_modules/clean-css/lib/utils/clone-array.js b/node_modules/clean-css/lib/utils/clone-array.js
new file mode 100644
index 000000000..b95ee6843
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/clone-array.js
@@ -0,0 +1,12 @@
+function cloneArray(array) {
+  var cloned = array.slice(0);
+
+  for (var i = 0, l = cloned.length; i < l; i++) {
+    if (Array.isArray(cloned[i]))
+      cloned[i] = cloneArray(cloned[i]);
+  }
+
+  return cloned;
+}
+
+module.exports = cloneArray;
diff --git a/node_modules/clean-css/lib/utils/format-position.js b/node_modules/clean-css/lib/utils/format-position.js
new file mode 100644
index 000000000..0e3713c19
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/format-position.js
@@ -0,0 +1,11 @@
+function formatPosition(metadata) {
+  var line = metadata[0];
+  var column = metadata[1];
+  var source = metadata[2];
+
+  return source ?
+    source + ':' + line + ':' + column :
+    line + ':' + column;
+}
+
+module.exports = formatPosition;
diff --git a/node_modules/clean-css/lib/utils/has-protocol.js b/node_modules/clean-css/lib/utils/has-protocol.js
new file mode 100644
index 000000000..fa1b61fd5
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/has-protocol.js
@@ -0,0 +1,7 @@
+var NO_PROTOCOL_RESOURCE_PATTERN = /^\/\//;
+
+function hasProtocol(uri) {
+  return !NO_PROTOCOL_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = hasProtocol;
diff --git a/node_modules/clean-css/lib/utils/is-data-uri-resource.js b/node_modules/clean-css/lib/utils/is-data-uri-resource.js
new file mode 100644
index 000000000..58558110f
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/is-data-uri-resource.js
@@ -0,0 +1,7 @@
+var DATA_URI_PATTERN = /^data:(\S*?)?(;charset=[^;]+)?(;[^,]+?)?,(.+)/;
+
+function isDataUriResource(uri) {
+  return DATA_URI_PATTERN.test(uri);
+}
+
+module.exports = isDataUriResource;
diff --git a/node_modules/clean-css/lib/utils/is-http-resource.js b/node_modules/clean-css/lib/utils/is-http-resource.js
new file mode 100644
index 000000000..5179c2ea9
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/is-http-resource.js
@@ -0,0 +1,7 @@
+var HTTP_RESOURCE_PATTERN = /^http:\/\//;
+
+function isHttpResource(uri) {
+  return HTTP_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = isHttpResource;
diff --git a/node_modules/clean-css/lib/utils/is-https-resource.js b/node_modules/clean-css/lib/utils/is-https-resource.js
new file mode 100644
index 000000000..c6938f57d
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/is-https-resource.js
@@ -0,0 +1,7 @@
+var HTTPS_RESOURCE_PATTERN = /^https:\/\//;
+
+function isHttpsResource(uri) {
+  return HTTPS_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = isHttpsResource;
diff --git a/node_modules/clean-css/lib/utils/is-import.js b/node_modules/clean-css/lib/utils/is-import.js
new file mode 100644
index 000000000..72abc3287
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/is-import.js
@@ -0,0 +1,7 @@
+var IMPORT_PREFIX_PATTERN = /^@import/i;
+
+function isImport(value) {
+  return IMPORT_PREFIX_PATTERN.test(value);
+}
+
+module.exports = isImport;
diff --git a/node_modules/clean-css/lib/utils/is-remote-resource.js b/node_modules/clean-css/lib/utils/is-remote-resource.js
new file mode 100644
index 000000000..fb3b61f3d
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/is-remote-resource.js
@@ -0,0 +1,7 @@
+var REMOTE_RESOURCE_PATTERN = /^(\w+:\/\/|\/\/)/;
+
+function isRemoteResource(uri) {
+  return REMOTE_RESOURCE_PATTERN.test(uri);
+}
+
+module.exports = isRemoteResource;
diff --git a/node_modules/clean-css/lib/utils/natural-compare.js b/node_modules/clean-css/lib/utils/natural-compare.js
new file mode 100644
index 000000000..7a5246762
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/natural-compare.js
@@ -0,0 +1,31 @@
+// adapted from http://nedbatchelder.com/blog/200712.html#e20071211T054956
+
+var NUMBER_PATTERN = /([0-9]+)/;
+
+function naturalCompare(value1, value2) {
+  var keys1 = ('' + value1).split(NUMBER_PATTERN).map(tryParseInt);
+  var keys2 = ('' + value2).split(NUMBER_PATTERN).map(tryParseInt);
+  var key1;
+  var key2;
+  var compareFirst = Math.min(keys1.length, keys2.length);
+  var i, l;
+
+  for (i = 0, l = compareFirst; i < l; i++) {
+    key1 = keys1[i];
+    key2 = keys2[i];
+
+    if (key1 != key2) {
+      return key1 > key2 ? 1 : -1;
+    }
+  }
+
+  return keys1.length > keys2.length ? 1 : (keys1.length == keys2.length ? 0 : -1);
+}
+
+function tryParseInt(value) {
+  return ('' + parseInt(value)) == value ?
+    parseInt(value) :
+    value;
+}
+
+module.exports = naturalCompare;
diff --git a/node_modules/clean-css/lib/utils/override.js b/node_modules/clean-css/lib/utils/override.js
new file mode 100644
index 000000000..e7f84948c
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/override.js
@@ -0,0 +1,34 @@
+function override(source1, source2) {
+  var target = {};
+  var key1;
+  var key2;
+  var item;
+
+  for (key1 in source1) {
+    item = source1[key1];
+
+    if (Array.isArray(item)) {
+      target[key1] = item.slice(0);
+    } else if (typeof item == 'object' && item !== null) {
+      target[key1] = override(item, {});
+    } else {
+      target[key1] = item;
+    }
+  }
+
+  for (key2 in source2) {
+    item = source2[key2];
+
+    if (key2 in target && Array.isArray(item)) {
+      target[key2] = item.slice(0);
+    } else if (key2 in target && typeof item == 'object' && item !== null) {
+      target[key2] = override(target[key2], item);
+    } else {
+      target[key2] = item;
+    }
+  }
+
+  return target;
+}
+
+module.exports = override;
diff --git a/node_modules/clean-css/lib/utils/split.js b/node_modules/clean-css/lib/utils/split.js
new file mode 100644
index 000000000..c91625506
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/split.js
@@ -0,0 +1,50 @@
+var Marker = require('../tokenizer/marker');
+
+function split(value, separator) {
+  var openLevel = Marker.OPEN_ROUND_BRACKET;
+  var closeLevel = Marker.CLOSE_ROUND_BRACKET;
+  var level = 0;
+  var cursor = 0;
+  var lastStart = 0;
+  var lastValue;
+  var lastCharacter;
+  var len = value.length;
+  var parts = [];
+
+  if (value.indexOf(separator) == -1) {
+    return [value];
+  }
+
+  if (value.indexOf(openLevel) == -1) {
+    return value.split(separator);
+  }
+
+  while (cursor < len) {
+    if (value[cursor] == openLevel) {
+      level++;
+    } else if (value[cursor] == closeLevel) {
+      level--;
+    }
+
+    if (level === 0 && cursor > 0 && cursor + 1 < len && value[cursor] == separator) {
+      parts.push(value.substring(lastStart, cursor));
+      lastStart = cursor + 1;
+    }
+
+    cursor++;
+  }
+
+  if (lastStart < cursor + 1) {
+    lastValue = value.substring(lastStart);
+    lastCharacter = lastValue[lastValue.length - 1];
+    if (lastCharacter == separator) {
+      lastValue = lastValue.substring(0, lastValue.length - 1);
+    }
+
+    parts.push(lastValue);
+  }
+
+  return parts;
+}
+
+module.exports = split;
diff --git a/node_modules/clean-css/lib/writer/helpers.js b/node_modules/clean-css/lib/writer/helpers.js
new file mode 100644
index 000000000..0b8999e95
--- /dev/null
+++ b/node_modules/clean-css/lib/writer/helpers.js
@@ -0,0 +1,219 @@
+var lineBreak = require('os').EOL;
+var emptyCharacter = '';
+
+var Breaks = require('../options/format').Breaks;
+var Spaces = require('../options/format').Spaces;
+
+var Marker = require('../tokenizer/marker');
+var Token = require('../tokenizer/token');
+
+function supportsAfterClosingBrace(token) {
+  return token[1][1] == 'background' || token[1][1] == 'transform' || token[1][1] == 'src';
+}
+
+function afterClosingBrace(token, valueIndex) {
+  return token[valueIndex][1][token[valueIndex][1].length - 1] == Marker.CLOSE_ROUND_BRACKET;
+}
+
+function afterComma(token, valueIndex) {
+  return token[valueIndex][1] == Marker.COMMA;
+}
+
+function afterSlash(token, valueIndex) {
+  return token[valueIndex][1] == Marker.FORWARD_SLASH;
+}
+
+function beforeComma(token, valueIndex) {
+  return token[valueIndex + 1] && token[valueIndex + 1][1] == Marker.COMMA;
+}
+
+function beforeSlash(token, valueIndex) {
+  return token[valueIndex + 1] && token[valueIndex + 1][1] == Marker.FORWARD_SLASH;
+}
+
+function inFilter(token) {
+  return token[1][1] == 'filter' || token[1][1] == '-ms-filter';
+}
+
+function disallowsSpace(context, token, valueIndex) {
+  return !context.spaceAfterClosingBrace && supportsAfterClosingBrace(token) && afterClosingBrace(token, valueIndex) ||
+    beforeSlash(token, valueIndex) ||
+    afterSlash(token, valueIndex) ||
+    beforeComma(token, valueIndex) ||
+    afterComma(token, valueIndex);
+}
+
+function rules(context, tokens) {
+  var store = context.store;
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    store(context, tokens[i]);
+
+    if (i < l - 1) {
+      store(context, comma(context));
+    }
+  }
+}
+
+function body(context, tokens) {
+  var lastPropertyAt = lastPropertyIndex(tokens);
+
+  for (var i = 0, l = tokens.length; i < l; i++) {
+    property(context, tokens, i, lastPropertyAt);
+  }
+}
+
+function lastPropertyIndex(tokens) {
+  var index = tokens.length - 1;
+
+  for (; index >= 0; index--) {
+    if (tokens[index][0] != Token.COMMENT) {
+      break;
+    }
+  }
+
+  return index;
+}
+
+function property(context, tokens, position, lastPropertyAt) {
+  var store = context.store;
+  var token = tokens[position];
+  var isPropertyBlock = token[2][0] == Token.PROPERTY_BLOCK;
+  var needsSemicolon = position < lastPropertyAt || isPropertyBlock;
+  var isLast = position === lastPropertyAt;
+
+  switch (token[0]) {
+    case Token.AT_RULE:
+      store(context, token);
+      store(context, position < lastPropertyAt ? semicolon(context, Breaks.AfterProperty, false) : emptyCharacter);
+      break;
+    case Token.COMMENT:
+      store(context, token);
+      break;
+    case Token.PROPERTY:
+      store(context, token[1]);
+      store(context, colon(context));
+      value(context, token);
+      store(context, needsSemicolon ? semicolon(context, Breaks.AfterProperty, isLast) : emptyCharacter);
+  }
+}
+
+function value(context, token) {
+  var store = context.store;
+  var j, m;
+
+  if (token[2][0] == Token.PROPERTY_BLOCK) {
+    store(context, openBrace(context, Breaks.AfterBlockBegins, false));
+    body(context, token[2][1]);
+    store(context, closeBrace(context, Breaks.AfterBlockEnds, false, true));
+  } else {
+    for (j = 2, m = token.length; j < m; j++) {
+      store(context, token[j]);
+
+      if (j < m - 1 && (inFilter(token) || !disallowsSpace(context, token, j))) {
+        store(context, Marker.SPACE);
+      }
+    }
+  }
+}
+
+function allowsBreak(context, where) {
+  return context.format && context.format.breaks[where];
+}
+
+function allowsSpace(context, where) {
+  return context.format && context.format.spaces[where];
+}
+
+function openBrace(context, where, needsPrefixSpace) {
+  if (context.format) {
+    context.indentBy += context.format.indentBy;
+    context.indentWith = context.format.indentWith.repeat(context.indentBy);
+    return (needsPrefixSpace && allowsSpace(context, Spaces.BeforeBlockBegins) ? Marker.SPACE : emptyCharacter) +
+      Marker.OPEN_CURLY_BRACKET +
+      (allowsBreak(context, where) ? lineBreak : emptyCharacter) +
+      context.indentWith;
+  } else {
+    return Marker.OPEN_CURLY_BRACKET;
+  }
+}
+
+function closeBrace(context, where, beforeBlockEnd, isLast) {
+  if (context.format) {
+    context.indentBy -= context.format.indentBy;
+    context.indentWith = context.format.indentWith.repeat(context.indentBy);
+    return (allowsBreak(context, Breaks.AfterProperty) || beforeBlockEnd && allowsBreak(context, Breaks.BeforeBlockEnds) ? lineBreak : emptyCharacter) +
+      context.indentWith +
+      Marker.CLOSE_CURLY_BRACKET +
+      (isLast ? emptyCharacter : (allowsBreak(context, where) ? lineBreak : emptyCharacter) + context.indentWith);
+  } else {
+    return Marker.CLOSE_CURLY_BRACKET;
+  }
+}
+
+function colon(context) {
+  return context.format ?
+    Marker.COLON + (allowsSpace(context, Spaces.BeforeValue) ? Marker.SPACE : emptyCharacter) :
+    Marker.COLON;
+}
+
+function semicolon(context, where, isLast) {
+  return context.format ?
+    Marker.SEMICOLON + (isLast || !allowsBreak(context, where) ? emptyCharacter : lineBreak + context.indentWith) :
+    Marker.SEMICOLON;
+}
+
+function comma(context) {
+  return context.format ?
+    Marker.COMMA + (allowsBreak(context, Breaks.BetweenSelectors) ? lineBreak : emptyCharacter) + context.indentWith :
+    Marker.COMMA;
+}
+
+function all(context, tokens) {
+  var store = context.store;
+  var token;
+  var isLast;
+  var i, l;
+
+  for (i = 0, l = tokens.length; i < l; i++) {
+    token = tokens[i];
+    isLast = i == l - 1;
+
+    switch (token[0]) {
+      case Token.AT_RULE:
+        store(context, token);
+        store(context, semicolon(context, Breaks.AfterAtRule, isLast));
+        break;
+      case Token.AT_RULE_BLOCK:
+        rules(context, token[1]);
+        store(context, openBrace(context, Breaks.AfterRuleBegins, true));
+        body(context, token[2]);
+        store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
+        break;
+      case Token.NESTED_BLOCK:
+        rules(context, token[1]);
+        store(context, openBrace(context, Breaks.AfterBlockBegins, true));
+        all(context, token[2]);
+        store(context, closeBrace(context, Breaks.AfterBlockEnds, true, isLast));
+        break;
+      case Token.COMMENT:
+        store(context, token);
+        store(context, allowsBreak(context, Breaks.AfterComment) ? lineBreak : emptyCharacter);
+        break;
+      case Token.RULE:
+        rules(context, token[1]);
+        store(context, openBrace(context, Breaks.AfterRuleBegins, true));
+        body(context, token[2]);
+        store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
+        break;
+    }
+  }
+}
+
+module.exports = {
+  all: all,
+  body: body,
+  property: property,
+  rules: rules,
+  value: value
+};
diff --git a/node_modules/clean-css/lib/writer/one-time.js b/node_modules/clean-css/lib/writer/one-time.js
new file mode 100644
index 000000000..33fccead6
--- /dev/null
+++ b/node_modules/clean-css/lib/writer/one-time.js
@@ -0,0 +1,52 @@
+var helpers = require('./helpers');
+
+function store(serializeContext, token) {
+  serializeContext.output.push(typeof token == 'string' ? token : token[1]);
+}
+
+function context() {
+  var newContext = {
+    output: [],
+    store: store
+  };
+
+  return newContext;
+}
+
+function all(tokens) {
+  var oneTimeContext = context();
+  helpers.all(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+function body(tokens) {
+  var oneTimeContext = context();
+  helpers.body(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+function property(tokens, position) {
+  var oneTimeContext = context();
+  helpers.property(oneTimeContext, tokens, position, true);
+  return oneTimeContext.output.join('');
+}
+
+function rules(tokens) {
+  var oneTimeContext = context();
+  helpers.rules(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+function value(tokens) {
+  var oneTimeContext = context();
+  helpers.value(oneTimeContext, tokens);
+  return oneTimeContext.output.join('');
+}
+
+module.exports = {
+  all: all,
+  body: body,
+  property: property,
+  rules: rules,
+  value: value
+};
diff --git a/node_modules/clean-css/lib/writer/simple.js b/node_modules/clean-css/lib/writer/simple.js
new file mode 100644
index 000000000..21e7f88a7
--- /dev/null
+++ b/node_modules/clean-css/lib/writer/simple.js
@@ -0,0 +1,52 @@
+var all = require('./helpers').all;
+
+var lineBreak = require('os').EOL;
+
+function store(serializeContext, token) {
+  var value = typeof token == 'string' ?
+    token :
+    token[1];
+  var wrap = serializeContext.wrap;
+
+  wrap(serializeContext, value);
+  track(serializeContext, value);
+  serializeContext.output.push(value);
+}
+
+function wrap(serializeContext, value) {
+  if (serializeContext.column + value.length > serializeContext.format.wrapAt) {
+    track(serializeContext, lineBreak);
+    serializeContext.output.push(lineBreak);
+  }
+}
+
+function track(serializeContext, value) {
+  var parts = value.split('\n');
+
+  serializeContext.line += parts.length - 1;
+  serializeContext.column = parts.length > 1 ? 0 : (serializeContext.column + parts.pop().length);
+}
+
+function serializeStyles(tokens, context) {
+  var serializeContext = {
+    column: 0,
+    format: context.options.format,
+    indentBy: 0,
+    indentWith: '',
+    line: 1,
+    output: [],
+    spaceAfterClosingBrace: context.options.compatibility.properties.spaceAfterClosingBrace,
+    store: store,
+    wrap: context.options.format.wrapAt ?
+      wrap :
+      function () { /* noop */  }
+  };
+
+  all(serializeContext, tokens);
+
+  return {
+    styles: serializeContext.output.join('')
+  };
+}
+
+module.exports = serializeStyles;
diff --git a/node_modules/clean-css/lib/writer/source-maps.js b/node_modules/clean-css/lib/writer/source-maps.js
new file mode 100644
index 000000000..4729eb055
--- /dev/null
+++ b/node_modules/clean-css/lib/writer/source-maps.js
@@ -0,0 +1,102 @@
+var SourceMapGenerator = require('source-map').SourceMapGenerator;
+var all = require('./helpers').all;
+
+var lineBreak = require('os').EOL;
+var isRemoteResource = require('../utils/is-remote-resource');
+
+var isWindows = process.platform == 'win32';
+
+var NIX_SEPARATOR_PATTERN = /\//g;
+var UNKNOWN_SOURCE = '$stdin';
+var WINDOWS_SEPARATOR = '\\';
+
+function store(serializeContext, element) {
+  var fromString = typeof element == 'string';
+  var value = fromString ? element : element[1];
+  var mappings = fromString ? null : element[2];
+  var wrap = serializeContext.wrap;
+
+  wrap(serializeContext, value);
+  track(serializeContext, value, mappings);
+  serializeContext.output.push(value);
+}
+
+function wrap(serializeContext, value) {
+  if (serializeContext.column + value.length > serializeContext.format.wrapAt) {
+    track(serializeContext, lineBreak, false);
+    serializeContext.output.push(lineBreak);
+  }
+}
+
+function track(serializeContext, value, mappings) {
+  var parts = value.split('\n');
+
+  if (mappings) {
+    trackAllMappings(serializeContext, mappings);
+  }
+
+  serializeContext.line += parts.length - 1;
+  serializeContext.column = parts.length > 1 ? 0 : (serializeContext.column + parts.pop().length);
+}
+
+function trackAllMappings(serializeContext, mappings) {
+  for (var i = 0, l = mappings.length; i < l; i++) {
+    trackMapping(serializeContext, mappings[i]);
+  }
+}
+
+function trackMapping(serializeContext, mapping) {
+  var line = mapping[0];
+  var column = mapping[1];
+  var originalSource = mapping[2];
+  var source = originalSource;
+  var storedSource = source || UNKNOWN_SOURCE;
+
+  if (isWindows && source && !isRemoteResource(source)) {
+    storedSource = source.replace(NIX_SEPARATOR_PATTERN, WINDOWS_SEPARATOR);
+  }
+
+  serializeContext.outputMap.addMapping({
+    generated: {
+      line: serializeContext.line,
+      column: serializeContext.column
+    },
+    source: storedSource,
+    original: {
+      line: line,
+      column: column
+    }
+  });
+
+  if (serializeContext.inlineSources && (originalSource in serializeContext.sourcesContent)) {
+    serializeContext.outputMap.setSourceContent(storedSource, serializeContext.sourcesContent[originalSource]);
+  }
+}
+
+function serializeStylesAndSourceMap(tokens, context) {
+  var serializeContext = {
+    column: 0,
+    format: context.options.format,
+    indentBy: 0,
+    indentWith: '',
+    inlineSources: context.options.sourceMapInlineSources,
+    line: 1,
+    output: [],
+    outputMap: new SourceMapGenerator(),
+    sourcesContent: context.sourcesContent,
+    spaceAfterClosingBrace: context.options.compatibility.properties.spaceAfterClosingBrace,
+    store: store,
+    wrap: context.options.format.wrapAt ?
+      wrap :
+      function () { /* noop */  }
+  };
+
+  all(serializeContext, tokens);
+
+  return {
+    sourceMap: serializeContext.outputMap,
+    styles: serializeContext.output.join('')
+  };
+}
+
+module.exports = serializeStylesAndSourceMap;
diff --git a/node_modules/clean-css/package.json b/node_modules/clean-css/package.json
new file mode 100644
index 000000000..f8a8db1f4
--- /dev/null
+++ b/node_modules/clean-css/package.json
@@ -0,0 +1,48 @@
+{
+  "name": "clean-css",
+  "version": "4.0.12",
+  "author": "Jakub Pawlowicz <contact@jakubpawlowicz.com> (http://twitter.com/jakubpawlowicz)",
+  "description": "A well-tested CSS minifier",
+  "license": "MIT",
+  "keywords": [
+    "css",
+    "minifier"
+  ],
+  "homepage": "https://github.com/jakubpawlowicz/clean-css",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/jakubpawlowicz/clean-css.git"
+  },
+  "bugs": {
+    "url": "https://github.com/jakubpawlowicz/clean-css/issues"
+  },
+  "main": "index.js",
+  "files": [
+    "lib",
+    "History.md",
+    "index.js",
+    "LICENSE"
+  ],
+  "scripts": {
+    "browserify": "browserify --standalone CleanCSS index.js | uglifyjs --compress --mangle -o cleancss-browser.js",
+    "bench": "node ./test/bench.js",
+    "check": "jshint .",
+    "prepublish": "npm run check",
+    "test": "vows"
+  },
+  "dependencies": {
+    "source-map": "0.5.x"
+  },
+  "devDependencies": {
+    "browserify": "13.x",
+    "http-proxy": "1.x",
+    "jshint": "2.x",
+    "nock": "9.x",
+    "server-destroy": "1.x",
+    "uglify-js": ">=2.6.1",
+    "vows": "0.8.x"
+  },
+  "engines": {
+    "node": ">= 4.0"
+  }
+}
author	Florian Dold <florian.dold@gmail.com>	2017-05-03 15:35:00 +0200
committer	Florian Dold <florian.dold@gmail.com>	2017-05-03 15:35:00 +0200
commit	de98e0b232509d5f40c135d540a70e415272ff85 (patch)
tree	a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/clean-css
parent	e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff)
download	wallet-core-de98e0b232509d5f40c135d540a70e415272ff85.tar.xz