CouchDB backing

This is a light touch update doing the minimum possible to let the site back onto CouchDB. This is intended as the first step towards a web interface for adding and removing meetings.

To test it out for yourself, set the environment variable thusly (on OSX, other OSes YMMV)
COUCH_URL="https://temp:sydjs@sydjs.iriscouch.com" && export COUCH_URL

IrisCouch is free below $5 which I doubt we'll ever hit. http://www.iriscouch.com/service

If the hivemind decides this is the way to go I'll disable the temp user. If anyone wants to deploy this to Heroku hit me up and I'll give you all the details for the server admin user and the iriscouch account.