Updating notifications and adding capacity to pass classes to style based on type of message.

![notifications](https://cloud.githubusercontent.com/assets/105849/4583974/aef09c42-4ff6-11e4-8616-1bdf7af898b3.png)

New admin notifications! This also sets the groundwork for to update the User facing notifications and allow visual coloring based on message type.

@angaither 

CC: @barryclark @DFurnes