Uses TeamMembers#index instead, to be more RESTful

Didn't bother with files in db/, config/, or features/

* .page_title  class added. Used for better page headers
* improved help page
* added back links for help pages
* show app version & revision on help page

Backend changes:
* Gitab::Version && Gitlab::Revision constants

Project - restyled show page, removed info page
Repository - restyled show page, added download option
Tags - added download options