Added centos-6.4 and centos-6.5 templates with ks file and installation scripts
Added {{ .Vars }} in order to get the "automatically injected" environment variables
Added a privisioning script to install VBoxGuestAdditions
Created a templates directory
Created a boxes directory
Changed the output .box file to the boxes directory
Run virtualbox headless (so it can be called from jenkins for example)
Deleted debugging 'prints'
Don't uninstall perl. It's installed by default on CentOS
Added templates from centos-6.0 to centos-6.3
Added templates for centos-5.9 and centos-5.10 and the ks file
Updated README with CentOS boxes