Add CommonJS support

Author: devongovett

jQuery.XDomainRequest.js

@@ -8,6 +8,9 @@
   if (typeof define === 'function' && define.amd) {
     // AMD. Register as anonymous module.
     define(['jquery'], factory);
+  } else if (typeof exports === 'object') {
+    // CommonJS
+    module.exports = factory(require('jquery'));
   } else {
     // Browser globals.
     factory(jQuery);
@@ -111,4 +114,4 @@ $.ajaxTransport('* text html xml json', function(options, userOptions, jqXHR) {
   };
 });
 
-}));
+}));