Test e2e mainnav settings

including e2e tests for the main navigation dropdown links.

to run the tests
npm install protractor
download chromedriver.exe
download selenium-server-standalone-2.41.0 jar 
save both to ripple-client/test/selenium  ( these can be added to .gitiignore )

> - grunt devserver
> - scripts\start-selenium.bat
> - scripts\e2e-test.bat

Let me know if you have any questions