Merge pull request #168 from samjulien/master

Adding check for withCredentials in XHR adapter (#138)

lib/adapters/xhr.js

@@ -88,7 +88,7 @@ module.exports = function xhrAdapter(resolve, reject, config) {
     var cookies = require('./../helpers/cookies');
 
     // Add xsrf header
-    var xsrfValue = isURLSameOrigin(config.url) ?
+    var xsrfValue =  config.withCredentials || isURLSameOrigin(config.url) ?
         cookies.read(config.xsrfCookieName || defaults.xsrfCookieName) :
         undefined;