chore(package): update to Protractor 4.x

This also fixes some issues on linux (e.g. angular/angular-phonecat#377).

Closes #378

Author: gkalpak

package.json

@@ -14,7 +14,7 @@
     "karma-firefox-launcher": "^0.1.7",
     "karma-jasmine": "^0.3.8",
     "karma-junit-reporter": "^0.4.1",
-    "protractor": "^3.2.2"
+    "protractor": "^4.0.9"
   },
   "scripts": {
     "postinstall": "bower install",