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diff --git a/node_modules/istanbul-lib-coverage/lib/file.js b/node_modules/istanbul-lib-coverage/lib/file.js
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+++ b/node_modules/istanbul-lib-coverage/lib/file.js
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+/*
+ Copyright 2012-2015, Yahoo Inc.
+ Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
+ */
+"use strict";
+
+function percent(covered, total) {
+    var tmp;
+    if (total > 0) {
+        tmp = 1000 * 100 * covered / total + 5;
+        return Math.floor(tmp / 10) / 100;
+    } else {
+        return 100.00;
+    }
+}
+
+function blankSummary() {
+    var empty = function () {
+        return {
+            total: 0,
+            covered: 0,
+            skipped: 0,
+            pct: 'Unknown'
+        };
+    };
+    return {
+        lines: empty(),
+        statements: empty(),
+        functions: empty(),
+        branches: empty()
+    };
+}
+
+// asserts that a data object "looks like" a summary coverage object
+function assertValidSummary(obj) {
+    var valid = obj &&
+        obj.lines &&
+        obj.statements &&
+        obj.functions &&
+        obj.branches;
+    if (!valid) {
+        throw new Error('Invalid summary coverage object, missing keys, found:' +
+            Object.keys(obj).join(','));
+    }
+}
+/**
+ * CoverageSummary provides a summary of code coverage . It exposes 4 properties,
+ * `lines`, `statements`, `branches`, and `functions`. Each of these properties
+ * is an object that has 4 keys `total`, `covered`, `skipped` and `pct`.
+ * `pct` is a percentage number (0-100).
+ * @param {Object|CoverageSummary} [obj=undefined] an optional data object or
+ * another coverage summary to initialize this object with.
+ * @constructor
+ */
+function CoverageSummary(obj) {
+    if (!obj) {
+        this.data = blankSummary();
+    } else if (obj instanceof CoverageSummary) {
+        this.data = obj.data;
+    } else {
+        this.data = obj;
+    }
+    assertValidSummary(this.data);
+}
+
+['lines', 'statements', 'functions', 'branches'].forEach(function (p) {
+    Object.defineProperty(CoverageSummary.prototype, p, {
+        enumerable: true,
+        get: function () {
+            return this.data[p];
+        }
+    });
+});
+
+/**
+ * merges a second summary coverage object into this one
+ * @param {CoverageSummary} obj - another coverage summary object
+ */
+CoverageSummary.prototype.merge = function (obj) {
+    var that = this,
+        keys = ['lines', 'statements', 'branches', 'functions'];
+    keys.forEach(function (key) {
+        that[key].total += obj[key].total;
+        that[key].covered += obj[key].covered;
+        that[key].skipped += obj[key].skipped;
+        that[key].pct = percent(that[key].covered, that[key].total);
+    });
+    return this;
+};
+
+/**
+ * returns a POJO that is JSON serializable. May be used to get the raw
+ * summary object.
+ */
+CoverageSummary.prototype.toJSON = function () {
+    return this.data;
+};
+
+// returns a data object that represents empty coverage
+function emptyCoverage(filePath) {
+    return {
+        path: filePath,
+        statementMap: {},
+        fnMap: {},
+        branchMap: {},
+        s: {},
+        f: {},
+        b: {}
+    };
+}
+// asserts that a data object "looks like" a coverage object
+function assertValidObject(obj) {
+    var valid = obj &&
+        obj.path &&
+        obj.statementMap &&
+        obj.fnMap &&
+        obj.branchMap &&
+        obj.s &&
+        obj.f &&
+        obj.b;
+    if (!valid) {
+        throw new Error('Invalid file coverage object, missing keys, found:' +
+            Object.keys(obj).join(','));
+    }
+}
+/**
+ * provides a read-only view of coverage for a single file.
+ * The deep structure of this object is documented elsewhere. It has the following
+ * properties:
+ *
+ * * `path` - the file path for which coverage is being tracked
+ * * `statementMap` - map of statement locations keyed by statement index
+ * * `functionMap` - map of function metadata keyed by function index
+ * * `branchMap` - map of branch metadata keyed by branch index
+ * * `s` - hit counts for statements
+ * * `f` - hit count for functions
+ * * `b` - hit count for branches
+ *
+ * @param {Object|FileCoverage|String} pathOrObj is a string that initializes
+ * and empty coverage object with the specified file path or a data object that
+ * has all the required properties for a file coverage object.
+ * @constructor
+ */
+function FileCoverage(pathOrObj) {
+    if (!pathOrObj) {
+        throw new Error("Coverage must be initialized with a path or an object");
+    }
+    if (typeof pathOrObj === 'string') {
+        this.data = emptyCoverage(pathOrObj);
+    } else if (pathOrObj instanceof FileCoverage) {
+        this.data = pathOrObj.data;
+    } else if (typeof pathOrObj === 'object') {
+        this.data = pathOrObj;
+    } else {
+        throw new Error('Invalid argument to coverage constructor');
+    }
+    assertValidObject(this.data);
+}
+/**
+ * returns computed line coverage from statement coverage.
+ * This is a map of hits keyed by line number in the source.
+ */
+FileCoverage.prototype.getLineCoverage = function () {
+    var statementMap = this.data.statementMap,
+        statements = this.data.s,
+        lineMap = {};
+
+    Object.keys(statements).forEach(function (st) {
+        if (!statementMap[st]) {
+            return;
+        }
+        var line = statementMap[st].start.line,
+            count = statements[st],
+            prevVal = lineMap[line];
+        if (prevVal === undefined || prevVal < count) {
+            lineMap[line] = count;
+        }
+    });
+    return lineMap;
+};
+/**
+ * returns an array of uncovered line numbers.
+ * @returns {Array} an array of line numbers for which no hits have been
+ *  collected.
+ */
+FileCoverage.prototype.getUncoveredLines = function () {
+    var lc = this.getLineCoverage(),
+        ret = [];
+    Object.keys(lc).forEach(function (l) {
+        var hits = lc[l];
+        if (hits === 0) {
+            ret.push(l);
+        }
+    });
+    return ret;
+};
+/**
+ * returns a map of branch coverage by source line number.
+ * @returns {Object} an object keyed by line number. Each object
+ * has a `covered`, `total` and `coverage` (percentage) property.
+ */
+FileCoverage.prototype.getBranchCoverageByLine = function () {
+    var branchMap = this.branchMap,
+        branches = this.b,
+        ret = {};
+    Object.keys(branchMap).forEach(function (k) {
+        var line = branchMap[k].line,
+            branchData = branches[k];
+        ret[line] = ret[line] || [];
+        ret[line].push.apply(ret[line], branchData);
+    });
+    Object.keys(ret).forEach(function (k) {
+        var dataArray = ret[k],
+            covered = dataArray.filter(function (item) { return item > 0; }),
+            coverage = covered.length / dataArray.length * 100;
+        ret[k] = { covered: covered.length, total: dataArray.length, coverage: coverage };
+    });
+    return ret;
+};
+
+// expose coverage data attributes
+['path', 'statementMap', 'fnMap', 'branchMap', 's', 'f', 'b' ].forEach(function (p) {
+    Object.defineProperty(FileCoverage.prototype, p, {
+        enumerable: true,
+        get: function () {
+            return this.data[p];
+        }
+    });
+});
+/**
+ * return a JSON-serializable POJO for this file coverage object
+ */
+FileCoverage.prototype.toJSON = function () {
+    return this.data;
+};
+/**
+ * merges a second coverage object into this one, updating hit counts
+ * @param {FileCoverage} other - the coverage object to be merged into this one.
+ *  Note that the other object should have the same structure as this one (same file).
+ */
+FileCoverage.prototype.merge = function (other) {
+    var that = this;
+    Object.keys(other.s).forEach(function (k) {
+        that.data.s[k] += other.s[k];
+    });
+    Object.keys(other.f).forEach(function (k) {
+        that.data.f[k] += other.f[k];
+    });
+    Object.keys(other.b).forEach(function (k) {
+        var i,
+            retArray = that.data.b[k],
+            secondArray = other.b[k];
+        for (i = 0; i < retArray.length; i += 1) {
+            retArray[i] += secondArray[i];
+        }
+    });
+};
+
+FileCoverage.prototype.computeSimpleTotals = function (property) {
+    var stats = this[property],
+        ret = {total: 0, covered: 0, skipped: 0};
+
+    if (typeof stats === 'function') {
+        stats = stats.call(this);
+    }
+    Object.keys(stats).forEach(function (key) {
+        var covered = !!stats[key];
+        ret.total += 1;
+        if (covered) {
+            ret.covered += 1;
+        }
+    });
+    ret.pct = percent(ret.covered, ret.total);
+    return ret;
+};
+
+FileCoverage.prototype.computeBranchTotals = function () {
+    var stats = this.b,
+        ret = {total: 0, covered: 0, skipped: 0};
+
+    Object.keys(stats).forEach(function (key) {
+        var branches = stats[key],
+            covered;
+        branches.forEach(function (branchHits) {
+            covered = branchHits > 0;
+            if (covered) {
+                ret.covered += 1;
+            }
+        });
+        ret.total += branches.length;
+    });
+    ret.pct = percent(ret.covered, ret.total);
+    return ret;
+};
+/**
+ * resets hit counts for all statements, functions and branches
+ * in this coverage object resulting in zero coverage.
+ */
+FileCoverage.prototype.resetHits = function () {
+    var statements = this.s,
+        functions = this.f,
+        branches = this.b;
+    Object.keys(statements).forEach(function (s) {
+        statements[s] = 0;
+    });
+    Object.keys(functions).forEach(function (f) {
+        functions[f] = 0;
+    });
+    Object.keys(branches).forEach(function (b) {
+        var hits = branches[b];
+        branches[b] = hits.map(function () { return 0; });
+    });
+};
+
+/**
+ * returns a CoverageSummary for this file coverage object
+ * @returns {CoverageSummary}
+ */
+FileCoverage.prototype.toSummary = function () {
+    var ret = {};
+    ret.lines = this.computeSimpleTotals('getLineCoverage');
+    ret.functions = this.computeSimpleTotals('f', 'fnMap');
+    ret.statements = this.computeSimpleTotals('s', 'statementMap');
+    ret.branches = this.computeBranchTotals();
+    return new CoverageSummary(ret);
+};
+
+module.exports = {
+    CoverageSummary: CoverageSummary,
+    FileCoverage: FileCoverage
+};