fix(ci): pin webdriver and zone versions (#3010)

Author: filipesilva

public/docs/_examples/package.json

@@ -29,7 +29,7 @@
     "reflect-metadata": "^0.1.8",
     "rxjs": "5.0.0-rc.4",
     "systemjs": "0.19.39",
-    "zone.js": "^0.7.2"
+    "zone.js": "0.7.2"
   },
   "devDependencies": {
     "@types/angular": "^1.5.16",
@@ -41,7 +41,7 @@
     "@types/angular-sanitize": "^1.3.3",
     "@types/jasmine": "~2.5.36",
     "@types/node": "^6.0.45",
-    "@types/selenium-webdriver": "^2.53.32",
+    "@types/selenium-webdriver": "2.53.32",
     "angular2-template-loader": "^0.4.0",
     "awesome-typescript-loader": "^2.2.4",
     "babel-cli": "^6.16.0",