Users can add personal statements to their profile page

https://trello.com/c/T3L94MvO/8-as-a-user-i-can-add-a-short-personal-statement-to-my-profile

![screenshot from 2014-11-18 14 28 13](https://cloud.githubusercontent.com/assets/8154429/5094540/c5afe26e-6f2f-11e4-9d49-1920eb93ecbd.png)

![screenshot from 2014-11-18 14 28 29](https://cloud.githubusercontent.com/assets/8154429/5094545/ca5451ba-6f2f-11e4-8dee-73f2a2a2895a.png)