Redhat support

In short:

- Add Gluster Epel recipe
- tested with CentOS 6.5, using Vagrant and Rackspace Cloud
- grabbed Gemfile, Rakefile, .rubocop.yml from https://github.com/AutomationSupport/templatestack and put them in this repo, for consistency with the latest *rules*
- Rubocop and Foodcritic are happy with this release

~Simone
Why only RHEL for this one? Maybe we can put a comment in here explaining for future modifiers to understand.