rolled back selenium-webdriver version to 2.53.1 due to webdriver bug

Author: John Doherty

package.json

@@ -40,6 +40,6 @@
     "merge": "^1.2.0",
     "phantomjs-prebuilt": "^2.1.12",
     "require-dir": "^0.3.0",
-    "selenium-webdriver": "^3.0.0-beta-2"
+    "selenium-webdriver": "^2.53.1"
   }
 }