Adding start/stop functionality in manage.py (#457).  source.py and journalist.py create a pidfile (the path of which is defined in config/base.py) and this is referenced for shutdown.
Improving the start and stop process by getting return status from start-stop-daemon.
Removing restart from commands
Cleanup from rebase develop
Merge branch 'develop' into pr/458

Need to import config individually to get the PIDFILEs without messing up the
test config. Added comment to fix in the future.

Conflicts:
	securedrop/manage.py