Add _.callback as an alias of _.createCallback.

lodash.js

@@ -6863,6 +6863,7 @@
      *
      * @static
      * @memberOf _
+     * @alias callback
      * @category Utilities
      * @param {*} [func=identity] The value to convert to a callback.
      * @param {*} [thisArg] The `this` binding of the created callback.
@@ -7384,6 +7385,7 @@
     lodash.zipObject = zipObject;
 
     // add aliases
+    lodash.callback = createCallback;
     lodash.collect = map;
     lodash.drop = rest;
     lodash.each = forEach;