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
IIRC, RHEL/Cent won't typically start a service on package install, but Ubuntu/Debian flavors will. But we should probably enable and start both either way; the chef provider implementation should do the right thing.