Update jQuery postMessage Transport Plugin to 1.1.1

Author: futhr

vendor/assets/javascripts/jquery-fileupload/cors/jquery.postmessage-transport.js

@@ -1,5 +1,5 @@
 /*
- * jQuery postMessage Transport Plugin 1.1
+ * jQuery postMessage Transport Plugin 1.1.1
  * https://github.com/blueimp/jQuery-File-Upload
  *
  * Copyright 2011, Sebastian Tschan
@@ -9,8 +9,7 @@
  * http://www.opensource.org/licenses/MIT
  */
 
-/*jslint unparam: true, nomen: true */
-/*global define, window, document */
+/* global define, window, document */
 
 (function (factory) {
     'use strict';
@@ -64,8 +63,9 @@
                 xhrUpload = options.xhr().upload;
             return {
                 send: function (_, completeCallback) {
+                    counter += 1;
                     var message = {
-                            id: 'postmessage-transport-' + (counter += 1)
+                            id: 'postmessage-transport-' + counter
                         },
                         eventName = 'message.' + message.id;
                     iframe = $(