Bump to v4.1.0.

isObject.js

@@ -24,8 +24,6 @@ define([], function() {
    * // => false
    */
   function isObject(value) {
-    // Avoid a V8 JIT bug in Chrome 19-20.
-    // See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
     var type = typeof value;
     return !!value && (type == 'object' || type == 'function');
   }