UIBubbleTableViewDelegate

I have added UIBubbleTableViewDelegate that has a protocol method that is called when the user taps the bubble field only.

![iOS Simulator Screen shot Apr 3 2013 11 30 12 AM](https://f.cloud.github.com/assets/3073827/332815/2a1c0430-9c3c-11e2-9d73-a78b432dbb61.png)