Added etherpad-lite with Nigels changes as per RT#12337
Changed the DATABASE_URL
Removed checks and removed a couple of comments.
Removed DATABASE_URL from Dockerfile
Removed DATABASE_URL from run-supervisord
Added some spaces to run-supervisord
Removed mysql check
Removing comment
Removed some of the commenting out
Merge pull request #25 from mattrm/etherpad-docker

Etherpad docker