updated for the latest versions of omnibus, vagrant and berkshelf; added...

Hi Fletcher,

I found myself in need of a full stack puppet installer and found yours (Thanks!).  I have updated several components to bring it up to date with the latest omnibus, vagrant and berkshelf.  In addition, I added vagrant definitions for CentOS 7 and Ubuntu 14.04, as well as updated the CentOS 5/6 minor versions to their latest (5.11 and 6.6).

There were some significant changes in the Vagrantfile as Centos 7 required a different run list than all the rest and it was cleaner to pull out the server info into a separate json file and read in the server definitions.  All changes are briefly described in the additional changelog file included.

-
Rob