Add a deploy script.

At the moment, this is pretty v0, but kinda works. It's a bit dangerous
though. Deploy searches dom0 for PV VMs, and assumes they're
puppetised. It gets a load of information about them, and then decides
to rm all of your git remotes. It then creates new remotes, using the
VMs it knows about, and some hard-coded machines. It then takes a
snapshot of each VM. Finally it git pushes (serially) at each machine it
knows about.
Add github and local repos
uncomment push