Mchabot version

Here is the completed the challenge. There is a thing that I didn't know how to tackle is the traffic mitigation, so  I haven't completed it. For the rest everything is working.

If I had to start from scratch, I would have started the project with the [rails-api](https://github.com/rails-api/rails-api) gem. I would have save some time for managing the environment and the database. The Rakefile would have been complete.  On the rails-api Readme there is a explanation why rails-api is a good alternative to Sinatra for API.

The Heroku app that I have created is located at:
http://mchabotbusbud.herokuapp.com/

I Hope that this pull request will fulfill your expectation.

Regards, 
Martin