RVM (ruby)

Setup rvm environment inside /usr/local/rvm.

The rvm group is rvm.

Exposed settings:

makina-states.localsettings.rvm.url:  url to download the installer makina-states.localsettings.rvm.rubies:  rubies to install as bases makina-states.localsettings.rvm.user:  base rvm user makina-states.localsettings.rvm.group:  base rvm user group