add ubuntu 13.04 server (amd64) template with rvm and ruby 2.0
skip building docs for chef and puppet
install ree and revert rubygems to 1.8.25 (rubygems 2.0.3 breaks chef)
Merge pull request #736 from ngpestelos/ringtail64-rvm

add ubuntu 13.04 server (amd64) template with rvm and ruby 2.0