Rewrite POM based on the appengine-skeleton-archetype

Yet another re-write of the POM, this time significantly simplifying it and allowing local/cloud deploys from the maven command line.

Breaks eclipse integration, so this change should not be merged until that can be addressed.
Merge pull request #250 from curtisullerich/pom

Rewrite POM based on the appengine-skeleton-archetype
Remove help link
Remove login view
Remove model for TAs

* TAs information is not relevant in mobile app
Update server endpoint urls
Remove sha.js, is no longer used