deactiviate vagrant-vbguest for CentOS
Require at least Vagrant version 1.6.3
fix gem installation and make it Ruby version < 1.9 compatible
use a Puppetforge Module for YUM
Upgrade hiera so it obeys pupppet log verbosity level
Remove conflicting join cluster directives
Merge branch 'feature/bootstrap' of github.com:davidl-zend/zendserverpuppet-vagrant into feature/bootstrap
Merge pull request #4 from michaelkrieg/support/20101007-01

CentOS box fixes