[#18] Fetch updates from git instead of cloning if already checked out
[#18] Make deployment branch configurable on command line
[#18] Migrate instead of creating the database if it already exists
[#18] Restart rails server after deploying
[#18] Ignore host id mismatch to allow redeploy after cloud server reset
Merge pull request #27 from brianauton/18-revision-deploys

18 revision deploys