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diff --git a/node_modules/deep-equal/index.js b/node_modules/deep-equal/index.js
new file mode 100644
index 000000000..0772f8c7e
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+++ b/node_modules/deep-equal/index.js
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+var pSlice = Array.prototype.slice;
+var objectKeys = require('./lib/keys.js');
+var isArguments = require('./lib/is_arguments.js');
+
+var deepEqual = module.exports = function (actual, expected, opts) {
+  if (!opts) opts = {};
+  // 7.1. All identical values are equivalent, as determined by ===.
+  if (actual === expected) {
+    return true;
+
+  } else if (actual instanceof Date && expected instanceof Date) {
+    return actual.getTime() === expected.getTime();
+
+  // 7.3. Other pairs that do not both pass typeof value == 'object',
+  // equivalence is determined by ==.
+  } else if (!actual || !expected || typeof actual != 'object' && typeof expected != 'object') {
+    return opts.strict ? actual === expected : actual == expected;
+
+  // 7.4. For all other Object pairs, including Array objects, equivalence is
+  // determined by having the same number of owned properties (as verified
+  // with Object.prototype.hasOwnProperty.call), the same set of keys
+  // (although not necessarily the same order), equivalent values for every
+  // corresponding key, and an identical 'prototype' property. Note: this
+  // accounts for both named and indexed properties on Arrays.
+  } else {
+    return objEquiv(actual, expected, opts);
+  }
+}
+
+function isUndefinedOrNull(value) {
+  return value === null || value === undefined;
+}
+
+function isBuffer (x) {
+  if (!x || typeof x !== 'object' || typeof x.length !== 'number') return false;
+  if (typeof x.copy !== 'function' || typeof x.slice !== 'function') {
+    return false;
+  }
+  if (x.length > 0 && typeof x[0] !== 'number') return false;
+  return true;
+}
+
+function objEquiv(a, b, opts) {
+  var i, key;
+  if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
+    return false;
+  // an identical 'prototype' property.
+  if (a.prototype !== b.prototype) return false;
+  //~~~I've managed to break Object.keys through screwy arguments passing.
+  //   Converting to array solves the problem.
+  if (isArguments(a)) {
+    if (!isArguments(b)) {
+      return false;
+    }
+    a = pSlice.call(a);
+    b = pSlice.call(b);
+    return deepEqual(a, b, opts);
+  }
+  if (isBuffer(a)) {
+    if (!isBuffer(b)) {
+      return false;
+    }
+    if (a.length !== b.length) return false;
+    for (i = 0; i < a.length; i++) {
+      if (a[i] !== b[i]) return false;
+    }
+    return true;
+  }
+  try {
+    var ka = objectKeys(a),
+        kb = objectKeys(b);
+  } catch (e) {//happens when one is a string literal and the other isn't
+    return false;
+  }
+  // having the same number of owned properties (keys incorporates
+  // hasOwnProperty)
+  if (ka.length != kb.length)
+    return false;
+  //the same set of keys (although not necessarily the same order),
+  ka.sort();
+  kb.sort();
+  //~~~cheap key test
+  for (i = ka.length - 1; i >= 0; i--) {
+    if (ka[i] != kb[i])
+      return false;
+  }
+  //equivalent values for every corresponding key, and
+  //~~~possibly expensive deep test
+  for (i = ka.length - 1; i >= 0; i--) {
+    key = ka[i];
+    if (!deepEqual(a[key], b[key], opts)) return false;
+  }
+  return typeof a === typeof b;
+}