Nerds can now add things!

Yooooo.

Instead of migrations I added a `db/seeds/things.rb` file that people can update with new `Things`. All we would have to do is pull in the PR, deploy the change to Heroku, and run `heroku run rake db:seed` and we are golden.

Among other things I added:

- database.yml configuration
- rvmrc support
- updated the readme