If you're actually planning to deploy this to heroku, you may need to make one little change to the code. Everything worked great except for this:
https://github.com/titanous/hubot/commit/6fc90ecd9b47cbb9714...
Also, you'll probably be restarting a bunch to get hubot up, but seems pretty stable after that.
Nice work Github! Took me about a 1/2 hour to get it up and running.