First step toward allowing callbacks to be called for all meetings in a
server, not for only a single meeting. Will need to change the way data
is stored on redis to improve the webhooks app, but it already works the
way it is now.

Started using coffee-script, updated the libraries, and now it subscribes
to all channels under 'bigbluebutton:*' so we can receive all events that
happened and select the ones we want.