Added Twitter Bot functionality

Create a twitter bot that will post random tweet and replying to tweet that mentioning it.

The app (https://immense-shelf-1367.herokuapp.com/) already running on heroku with the scheduler running the task every hour.

The twitter handle for the twitter bot is @ruby_gecko.
I love this so much! I meant http://en.wikipedia.org/wiki/Battleship_(game), but this is hilarious too.