Add new styles to messages modal

@skrugman @jh-bate care to have a look? Thanks!

![screen shot 2014-05-23 at 4 24 37 pm](https://cloud.githubusercontent.com/assets/1306536/3067800/049f9a4a-e287-11e3-9624-b43fbfa7fbb1.png)

![screen shot 2014-05-23 at 4 13 22 pm](https://cloud.githubusercontent.com/assets/1306536/3067803/0afe7064-e287-11e3-9ef2-dfc3e9d2458d.png)