feat(gen): unify testing framework

Changes:
- add prompt for Jasmine or Mocha
- if Mocha choosen, prompt for Expect or Should
- use `<%= does() %>` to dynamically insert assertions (expect|should)
- add mocha variants for protractor tests
- add mocha options to protractor.conf
- remove `test/fixtures/(bower|package).json` from repo
- move runE2E functionality to runTest and simplify switch
- comment generator test functions

Note:
Server-side jasmine test are needed to fully unify testing frameworks.
Once Jasmine tests are included for server, mocha dep can be removed
fully when selecting Jasmine.