Merge pull request #281 from 3rd-Eden/master

[fix] new XMLHttpRequest always returns an object

Author: rauchg

lib/transports/index.js

@@ -1,4 +1,3 @@
-
 /**
  * Module dependencies
  */
@@ -43,7 +42,7 @@ function polling (opts) {
   opts.xdomain = xd;
   xhr = new XMLHttpRequest(opts);
 
-  if (xhr && !opts.forceJSONP) {
+  if ('open' in xhr && !opts.forceJSONP) {
     return new XHR(opts);
   } else {
     return new JSONP(opts);