protractor version bump

Author: Bogdan Livadariu

package.json

@@ -18,7 +18,7 @@
     "grunt-jasmine-node": "~0.2.1",
     "grunt-protractor-runner": "^1.1.4",
     "phantomjs": "2.1.3",
-    "protractor": "~1.5.0"
+    "protractor": "2.5.1"
   },
   "repository": {
     "type": "git",