Update vendor/underscore.

Former-commit-id: 3d39397aaee8408778b738c3aa105eda67abd6bc

vendor/underscore/underscore.js

@@ -213,13 +213,11 @@
   // Determine if the array or object contains a given value (using `===`).
   // Aliased as `include`.
   _.contains = _.include = function(obj, target) {
-    var found = false;
-    if (obj == null) return found;
+    if (obj == null) return false;
     if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
-    found = any(obj, function(value) {
+    return any(obj, function(value) {
       return value === target;
     });
-    return found;
   };
 
   // Invoke a method (with arguments) on every item in a collection.
@@ -439,6 +437,11 @@
   // been sorted, you have the option of using a faster algorithm.
   // Aliased as `unique`.
   _.uniq = _.unique = function(array, isSorted, iterator, context) {
+    if (_.isFunction(isSorted)) {
+      context = iterator;
+      iterator = isSorted;
+      isSorted = false;
+    }
     var initial = iterator ? _.map(array, iterator, context) : array;
     var results = [];
     var seen = [];