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
> and restore the test suites section to be sure we converge the same thing
(commit 3718468122da4b222b63f38283c59cd8db0b9a9d)