Remove lucid, update Precise to 12.04.5

This:
 - Removes all the lucid boxes
 - Updates Precise to 12.04.5
 - Refactors the post-install slightly to work on 12.04.5
 - Adds a new box (govuk_dev_precise64_vmware_fusion)

This repo can now build virtualbox with `make precise_virtualbox` and also build vmware with
`make precise_vmware` providing you have VMWare Fusion installed. It can also build both
boxes with `make precise`.

I have not yet uploaded the resulting boxes to s3://gds-boxes/ because I'm still completing the
testing of puppet runs on the new boxes, but this PR could still be merged if it passes review
as no Vagrant will use the new boxes until versions are bumped in the respective repos.