DEV-1245 use rsync for deploying CRMS

[moseshll]

This is pretty much boilerplate cribbed from the babel repo.

Reviewer: just a quick check to make sure I'm not forgetting anything. Staging credentials is handled by a script not currently under version control.

[aelkiss]

Looks reasonable at first glance to me. I would recommend a couple things before cutting over:

• temporarily add an echo in front of the rsync command so that it prints what it would run, but doesn't actually run it
• use the -n flag with deploy-app to do a dry run & verify what would change
• consider also using the --checksums flag with rsync (for testing) to verify what files are actually different (vs. what just has timestamp/ownership/permissions changes)