new ruby version and fix of Ubuntu

ability to remove source branch after merge

Clean up helpers

Improve performance when handling large repo's

Compatibilizing with a fresh install of ubuntu 12.04 LTS i386 (virtualized)

Clean up application_helper.rb code

Clean up tab_helper.rb code

Use the faster alternative methods in grit to count tags and branches (which I added). This is much faster in all cases, but especially on large repositories the difference should be obvious.

Dashboard feed

Bash path in post-receive-hook

removing /tmp/gitolite-admin in installation script with sudo

Bugfix/encoding