Update README.md

Added:
* [Getting Started With Protractor And Page Objects For AngularJS E2E Testing] (http://gaslight.co/blog/getting-started-with-protractor-and-page-objects-for-angularjs-e2e-testing)
* [Canceling $http Requests in AngularJS] (http://odetocode.com/blogs/scott/archive/2014/04/24/canceling-http-requests-in-angularjs.aspx)