#303 Removed icon in error label of RegistrationView.

Adjusted scss in the RegistrationView so that the error label didn't have the exclamation mark icon.
![screen shot 2014-09-14 at 11 21 52 pm](https://cloud.githubusercontent.com/assets/5726560/4267681/cd85c4e8-3ca0-11e4-8b45-74ff61812c7a.png)

- This isn't Python... `background: none;`
- Alphabetize CSS properties