Capistrano setup

This is the initial setup for capistrano deployment. It *should* do the git pull, recompile assets, db migration, and apache restart all automatically. I think more needs to be done and some testing but it is finally getting started.
I think production runs off of bz-stable doesn't it? IIRC bz-master is supposed to match upstream for the purposes of filing bug fixes with instructure. I keep mixing these up though.