Muninn heroku

Got huginn running via postgres locally and on heroku. This PR includes changes from https://github.com/robertjwhitney/huginn/tree/muninn as well as 2 commits I had to make. 

It's running on heroku here: https://immense-plateau-1677.herokuapp.com

Once you merge this pr you can run things local by adding a `.env` file with:
`SECRET_TOKEN=a-very-long-string-but-not-this-one-pick-something-else`

then to deploy on heroku:

    git push heroku master 
    heroku run rake db:migrate
    heroku run rake db:seed
    heroku config:set SECRET_TOKEN=a-very-long-string-but-not-this-one-pick-something-else
    heroku open