fix(e2e-tests): fixes bug that we couldn't run e2e tests

- introduces karma:continuous_e2e in combination with connect:testserver
- adds e2e task to certain sub tasks to get in run when specific files change
- adds karma-ng-scenario explicitly
- adds proper e2e test for app.spec.js
tests(e2e): adds additional tests for ngBoilerplate.home
Merge pull request #31 from neoskop/e2e

fix(e2e-tests): fixes bug that we couldn't run e2e tests