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
I'm thinking we should use `yum-epel` everywhere, and then this cookbook could also contain a `yum-gluster` for adding the other repo. Then switching back and forth would be a matter of picking the recipe you want. In any case, this isn't a blocker.