chore(test): fix npm test to install missing prerequisites

Author: cnishina

package.json

@@ -43,7 +43,7 @@
   },
   "main": "lib/protractor.js",
   "scripts": {
-    "pretest": "node_modules/.bin/jshint lib spec scripts",
+    "pretest": "./scripts/pretest.sh",
     "test": "node scripts/test.js",
     "start": "node testapp/scripts/web-server.js"
   },

scripts/pretest.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# When running `npm test`, this script is intended to run during pretest step.
+
+WS=$(pwd)                          # the protractor directory
+$WS/bin/webdriver-manager update   # updates the local webdriver manager
+$WS/node_modules/.bin/jshint lib spec scripts
+cd $WS/website && npm install      # installs dependencies for the website