Getting Started With Development added to README (WIP #42)

I've addded a very basic section to the README which goes through how to get this going on your local machine.

- Removed ```database.yml```.
- Added ```database.yml.example``` along with ```.env.example``` which can be simply be copied and renamed to get everything working. 
- Removed the ```bin``` directory which was put there by bundler.
- Added ```Procfile.dev``` for local development with foreman.