Contact group dialogue state

We need to add a dialogue state for adding a recipient to a contact group. Check out the screen shots for the UI.

![screen shot 2014-05-05 at 11 30 34 am](https://cloud.githubusercontent.com/assets/1521387/2876564/8a4b5b96-d438-11e3-982e-f29118a7ab0d.png)

![screen shot 2014-05-05 at 11 30 43 am](https://cloud.githubusercontent.com/assets/1521387/2876565/905e54b6-d438-11e3-95c3-0d4efd6c09e5.png)