WIP: add E2E test suite unrelated to docs examples

This is ongoing, bear with me while I hack on this :<
Hm, maybe it's best to always use `localhost:8000` for the `baseUrl` and then have docs tests add the `/build/docs` path. Maybe in https://github.com/angular/dgeni-packages/blob/master/examples/templates/protractorTests.template.js#L6? @petebacondarwin  do you think that would be a reasonable change to dgeni-packages?