Disable Guest Additions mode entirely

Installing VirtualBox Guest Additions will tie this box into a
particular version of VirtualBox, forcing the user to either run a
specific version or risk encountering errors.

Omitting Guest Additions from this box and asking the user to use the
vagrant-vbguest plugin will allow them to automatically match a version
of Guest Additions to the version of VirtualBox installed on their
system.
Ignore intermediate output files
Install puppet in box
Tidy up provisioning scripts