Fixes #555 - removes O.R. request for comment text

Removes request for comment text from OpenReferral page and reformats sign up form.

Before:
![screen shot 2014-08-26 at 10 17 20 am](https://cloud.githubusercontent.com/assets/704760/4045668/e414acee-2d2b-11e4-8493-3af0ac47c9b8.png)

After:
![screen shot 2014-08-26 at 10 30 44 am](https://cloud.githubusercontent.com/assets/704760/4045871/9bd71e74-2d2d-11e4-8c12-195d639642a8.png)

cc @greggish