configuration for deploying an experimental server

I had to do a bit of configuration to set up a new instance on heroku for experimenting with a new feature.  I think this would be good to add to the main repo.  

If you like this approach.  I would add this to the contributor guidelines on the wiki:

### Experimental Feature Development  
It is a good idea to get user feedback on your feature, you can set up a little instance on heroku and send a note out to the organizers google group to get people to try it out
```
heroku create --app mytroll
heroku config:set RACK_ENV=staging RAILS_ENV=staging
heroku config:set HOST_URL=mytroll.herokuapp.com/
git push heroku myfeaturebranch:master
heroku run rake db:seed
```