mention the check_pipeline_status.py program somewhere in the documentation
Merge branch 'develop' of github.com:mfriedel/pydpiper into develop

Conflicts:
	README
The server now dies when there are no more running/queued executors, and it's unable to launch any new ones, because too many have failed already (--max-failed-executors). Also added some info to the README.md about the check_pipeline_status.py program