update to latest ruby
New role that makes sure to run 'gem install' in a login shell so that rbenv will be evaluated, putting the gems into the correct ruby.
This branch fixes #23
per @ninjabong and @rricard, depend on the rbenv role
Merge branch 'master' into rbenv_fix
switching to bash
Merge pull request #28 from rjacoby/rbenv_fix

Rbenv fix