diff --git a/vendor/underscore/test/arrays.js b/vendor/underscore/test/arrays.js
index 008766a72..57da88fe5 100644
--- a/vendor/underscore/test/arrays.js
+++ b/vendor/underscore/test/arrays.js
@@ -144,7 +144,6 @@ $(document).ready(function() {
     equal(_.indexOf(numbers, 2), 1, 'can compute indexOf, even without the native function');
     var result = (function(){ return _.indexOf(arguments, 2); })(1, 2, 3);
     equal(result, 1, 'works on an arguments object');
-    equal(_.indexOf(null, 2), -1, 'handles nulls properly');
 
     var numbers = [10, 20, 30, 40, 50], num = 35;
     var index = _.indexOf(numbers, num, true);
@@ -170,7 +169,6 @@ $(document).ready(function() {
     equal(_.lastIndexOf(numbers, 0), 8, 'lastIndexOf the other element');
     var result = (function(){ return _.lastIndexOf(arguments, 1); })(1, 0, 1, 0, 0, 1, 0, 0, 0);
     equal(result, 5, 'works on an arguments object');
-    equal(_.indexOf(null, 2), -1, 'handles nulls properly');
 
     numbers = [1, 2, 3, 1, 2, 3, 1, 2, 3];
     index = _.lastIndexOf(numbers, 2, 2);
diff --git a/vendor/underscore/test/collections.js b/vendor/underscore/test/collections.js
index b1eb11999..095ace1d3 100644
--- a/vendor/underscore/test/collections.js
+++ b/vendor/underscore/test/collections.js
@@ -25,10 +25,6 @@ $(document).ready(function() {
     answer = null;
     _.each([1, 2, 3], function(num, index, arr){ if (_.include(arr, num)) answer = true; });
     ok(answer, 'can reference the original collection from inside the iterator');
-
-    answers = 0;
-    _.each(null, function(){ ++answers; });
-    equal(answers, 0, 'handles a null properly');
   });
 
   test('map', function() {
@@ -54,9 +50,6 @@ $(document).ready(function() {
 
     var ids = _.map(document.images, function(n){ return n.id; });
     ok(ids[0] == 'chart_image', 'can use collection methods on HTMLCollections');
-
-    var ifnull = _.map(null, function(){});
-    ok(_.isArray(ifnull) && ifnull.length === 0, 'handles a null properly');
   });
 
   test('reduce', function() {
@@ -76,15 +69,6 @@ $(document).ready(function() {
     var sum = _.reduce([1, 2, 3], function(sum, num){ return sum + num; });
     equal(sum, 6, 'default initial value');
 
-    var ifnull;
-    try {
-      _.reduce(null, function(){});
-    } catch (ex) {
-      ifnull = ex;
-    }
-    ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly');
-
-    ok(_.reduce(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
     equal(_.reduce([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
     raises(function() { _.reduce([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
   });
@@ -99,19 +83,9 @@ $(document).ready(function() {
     var list = _.foldr(["foo", "bar", "baz"], function(memo, str){ return memo + str; });
     equal(list, 'bazbarfoo', 'default initial value');
 
-    var ifnull;
-    try {
-      _.reduceRight(null, function(){});
-    } catch (ex) {
-      ifnull = ex;
-    }
-    ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly');
-
     var sum = _.reduceRight({a: 1, b: 2, c: 3}, function(sum, num){ return sum + num; });
     equal(sum, 6, 'default initial value on object');
 
-    ok(_.reduceRight(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
-
     equal(_.reduceRight([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
     raises(function() { _.reduceRight([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
 
@@ -336,6 +310,8 @@ $(document).ready(function() {
     equal(grouped.constructor.length, 1);
     equal(grouped.hasOwnProperty.length, 2);
 
+    var array = [{}];
+    _.groupBy(array, function(value, index, obj){ ok(obj === array); });
   });
 
   test('countBy', function() {
@@ -357,6 +333,9 @@ $(document).ready(function() {
     });
     equal(grouped.constructor, 1);
     equal(grouped.hasOwnProperty, 2);
+
+    var array = [{}];
+    _.countBy(array, function(value, index, obj){ ok(obj === array); });
   });
 
   test('sortedIndex', function() {
diff --git a/vendor/underscore/underscore-min.js b/vendor/underscore/underscore-min.js
index bf9741db4..8ec052be4 100644
--- a/vendor/underscore/underscore-min.js
+++ b/vendor/underscore/underscore-min.js
@@ -1,15 +1,5 @@
-// Underscore.js 1.3.3
-// (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
-// Underscore may be freely distributed under the MIT license.
-// Portions of Underscore are inspired or borrowed from Prototype,
-// Oliver Steele's Functional, and John Resig's Micro-Templating.
-// For all details and documentation:
-// http://documentcloud.github.com/underscore
-//     Underscore.js 1.3.3
+//     Underscore.js 1.4.0
+//     http://underscorejs.org
 //     (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
 //     Underscore may be freely distributed under the MIT license.
-//     Portions of Underscore are inspired or borrowed from Prototype,
-//     Oliver Steele's Functional, and John Resig's Micro-Templating.
-//     For all details and documentation:
-//     http://documentcloud.github.com/underscore
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\ No newline at end of file
diff --git a/vendor/underscore/underscore.js b/vendor/underscore/underscore.js
index dc1cf676a..a3d378aa3 100644
--- a/vendor/underscore/underscore.js
+++ b/vendor/underscore/underscore.js
@@ -1,10 +1,7 @@
-//     Underscore.js 1.3.3
+//     Underscore.js 1.4.0
+//     http://underscorejs.org
 //     (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
 //     Underscore may be freely distributed under the MIT license.
-//     Portions of Underscore are inspired or borrowed from Prototype,
-//     Oliver Steele's Functional, and John Resig's Micro-Templating.
-//     For all details and documentation:
-//     http://documentcloud.github.com/underscore
 
 (function() {
 
@@ -68,7 +65,7 @@
   }
 
   // Current version.
-  _.VERSION = '1.3.3';
+  _.VERSION = '1.4.0';
 
   // Collection Functions
   // --------------------
@@ -77,7 +74,6 @@
   // Handles objects with the built-in `forEach`, arrays, and raw objects.
   // Delegates to **ECMAScript 5**'s native `forEach` if available.
   var each = _.each = _.forEach = function(obj, iterator, context) {
-    if (obj == null) return;
     if (nativeForEach && obj.forEach === nativeForEach) {
       obj.forEach(iterator, context);
     } else if (obj.length === +obj.length) {
@@ -97,7 +93,6 @@
   // Delegates to **ECMAScript 5**'s native `map` if available.
   _.map = _.collect = function(obj, iterator, context) {
     var results = [];
-    if (obj == null) return results;
     if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context);
     each(obj, function(value, index, list) {
       results[results.length] = iterator.call(context, value, index, list);
@@ -109,7 +104,6 @@
   // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
   _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
     var initial = arguments.length > 2;
-    if (obj == null) obj = [];
     if (nativeReduce && obj.reduce === nativeReduce) {
       if (context) iterator = _.bind(iterator, context);
       return initial ? obj.reduce(iterator, memo) : obj.reduce(iterator);
@@ -130,7 +124,6 @@
   // Delegates to **ECMAScript 5**'s native `reduceRight` if available.
   _.reduceRight = _.foldr = function(obj, iterator, memo, context) {
     var initial = arguments.length > 2;
-    if (obj == null) obj = [];
     if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
       if (context) iterator = _.bind(iterator, context);
       return arguments.length > 2 ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
@@ -170,7 +163,6 @@
   // Aliased as `select`.
   _.filter = _.select = function(obj, iterator, context) {
     var results = [];
-    if (obj == null) return results;
     if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context);
     each(obj, function(value, index, list) {
       if (iterator.call(context, value, index, list)) results[results.length] = value;
@@ -181,7 +173,6 @@
   // Return all the elements for which a truth test fails.
   _.reject = function(obj, iterator, context) {
     var results = [];
-    if (obj == null) return results;
     each(obj, function(value, index, list) {
       if (!iterator.call(context, value, index, list)) results[results.length] = value;
     });
@@ -194,7 +185,6 @@
   _.every = _.all = function(obj, iterator, context) {
     iterator || (iterator = _.identity);
     var result = true;
-    if (obj == null) return result;
     if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
     each(obj, function(value, index, list) {
       if (!(result = result && iterator.call(context, value, index, list))) return breaker;
@@ -208,7 +198,6 @@
   var any = _.some = _.any = function(obj, iterator, context) {
     iterator || (iterator = _.identity);
     var result = false;
-    if (obj == null) return result;
     if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
     each(obj, function(value, index, list) {
       if (result || (result = iterator.call(context, value, index, list))) return breaker;
@@ -220,7 +209,6 @@
   // Aliased as `include`.
   _.contains = _.include = function(obj, target) {
     var found = false;
-    if (obj == null) return found;
     if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
     found = any(obj, function(value) {
       return value === target;
@@ -326,7 +314,7 @@
     var result = {};
     var iterator = lookupIterator(value);
     each(obj, function(value, index) {
-      var key = iterator.call(context, value, index);
+      var key = iterator.call(context, value, index, obj);
       behavior(result, key, value);
     });
     return result;
@@ -512,7 +500,6 @@
   // If the array is large and already in sort order, pass `true`
   // for **isSorted** to use binary search.
   _.indexOf = function(array, item, isSorted) {
-    if (array == null) return -1;
     var i = 0, l = array.length;
     if (isSorted) {
       if (typeof isSorted == 'number') {
@@ -529,7 +516,6 @@
 
   // Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
   _.lastIndexOf = function(array, item, fromIndex) {
-    if (array == null) return -1;
     if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item, fromIndex);
     var i = (fromIndex != null ? fromIndex : array.length);
     while (i--) if (array[i] === item) return i;