Adding support for web workers, and react-native

closes #70, closes #98

lib/helpers/urlIsSameOrigin.js

@@ -1,5 +1,11 @@
 'use strict';
 
+/**
+ * WARNING:
+ *  This file makes references to objects that aren't safe in all environments.
+ *  Please see lib/utils.isStandardBrowserEnv before including this file.
+ */
+
 var utils = require('./../utils');
 var msie = /(msie|trident)/i.test(navigator.userAgent);
 var urlParsingNode = document.createElement('a');