Cobbler can add gems (and compile if needed) and delete them. Still have some bugs to work out but it doesn't suck too much.
Bump to b8
Don't use Shoes.setup to install gems from Cobbler. Not fixed yet.
Cobbler fixes
  1. Swallow the 'successfuly deleted gem' terminal message
  2. Replace Gem::Specification._all() with Gem::Specification.each