Include a box URL for the precise64 basebox

This will automatically download the box on the first vagrant up unless
a box of the same name already exists.
The vagrant installer is now the prefered and soon to be only approach
Puppet now contains the pip provider, see notes from puppet-pip github repo
use list of packages to reduce repetition in manifest
pedantic puppet lint fixes
Merge pull request #5 from garethr/tidy_up_puppet_vagrant

Brilliant, thanks. I didn't know you could do lists of packages. That's much nicer.