[[!comment format=mdwn
 username="joey"
 subject="""comment 4"""
 date="2016-03-08T07:28:59Z"
 content="""
How about this simple approch: If stack.yaml exists, have propellor use
stack for rebuilding itself.

This assimes propellor doesn't ship a stack.yaml, which I think is ok.
The user can `stack init` to create one.
"""]]
