Upgrade OS, Vagrantfile and puppet modules

- Moved external puppet modules into submodules
- Updated Vagrantfile with a new virtualbox from PuppetLabs
- This upgrades the OS to CentOS 6.4
- This upgrades the external puppet modules to recent versions
Fix params load for vagrant 1.3.x
Make the vagrant instance headless
Merge pull request #196 from rtuin/feature/upgrade-devbox

Upgrade OS (+Vbox Guest additions), Vagrantfile and puppetmodules