Automated starting/stopping of processes using Supervisor

With this pull request, a person evaluating edx-ora, can start up all the processes (LMS, CMS, edx-ora, Celery, xqueue, MongoDB, RabbitMQ) using one command:

```sudo supervisord -c supervisor.conf```

This assumes they are using the Vagrant image, but the supervisord.conf file could be modified to run the processes as any user, not just the vagrant user.