Use capistrano multistage for our multiple deploy targets

@akofink I wanted to let you test this before I merged it with master. I could only test it this far without NCSU network access. Should at least be a start in the right direction though.

![Screen Shot 2013-04-25 at 10 42 08 PM](https://f.cloud.github.com/assets/64751/429117/18073ef8-ae35-11e2-9684-a8bf65b27b1f.png)