Twitter Card 

Added twitter card support.

![screenshot 2014-05-10 13 08 37](https://cloud.githubusercontent.com/assets/15382/2936600/c64369aa-d865-11e3-8e69-931100c76701.png)

We can include a image in the card, to make the BBME log larger, but I think it would be overkill.

This branch builds on top of #19, This branch should be merge in to it and then master.