Update survey style

* Increases height of the survey on the page by removing the title & moving the instructions into the scrollable area.
* Adds a light horizontal bar across the top of the survey.

![screen shot 2014-10-19 at 10 17 44 am](https://cloud.githubusercontent.com/assets/4962198/4693939/04bf41c2-57b4-11e4-861c-f80f143faf4d.png)
![screen shot 2014-10-19 at 10 17 48 am](https://cloud.githubusercontent.com/assets/4962198/4693938/04bb81fe-57b4-11e4-9d7f-d51a41b943a6.png)
![screen shot 2014-10-19 at 10 17 55 am](https://cloud.githubusercontent.com/assets/4962198/4693940/04bfaca2-57b4-11e4-883f-46cc17e66516.png)