* layout: add 'Groups' item to main_menu
* admin/dashboard: add a ui-box for groups
* projects and groups: remove nav tabs

Seeing `:javascript` all over Views feels like a code smell. This goes a
long way towards reducing the amount of JS in views, but there's still
plenty to be done on that front.

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

2. Fixed bug: post-receive file was not added when create project via admin