Updated plugins to use the new format.
Updated to use process manager instead of start script.
Upgraded build pack utils.
Upgraded build pack utils.
Changed rewrite to use build pack utils.
Upgraded build pack utils.
Added start script that uses a .env and .procs file.  It sets up the specified environment and runs the processes.
Updated to copy build pack utils to app.  These are used by rewrite and start script.  Also copy rewrite and start scripts.
Upgraded build pack utils.
Set PYTHONPATH so rewrite script can find build pack utils.  Added test for Nginx config.
Upgraded build pack utils.
Initialize output so it's always set.
Set executable bit.
Modified copy to look for either of the two files.
Modified tests to check that process manager is installed and being used.