Increase uWSGI backlog to 4096.

100 is pathetic.
Update the engine.
Enable the uwsgi stats server.
Revert "Attempt to use uwsgi instead of gunicorn."

This reverts commit a3e258dea1d0a36fbc23c5fb6542f1ee2c7b0c3e.

Conflicts:
	.openshift/action_hooks/start
	.openshift/action_hooks/stop
	nginx.conf.dg
	uwsgi.conf.ini