added the user's role to the left sidebar

This resolves part of issue #148 

Specifically, I added the user's role under where it says "Welcome [user name]!" in the left side bar. It should look like the image below. When testing, make sure the user's role (in worker and pc view) appears correctly. 

![image](https://cloud.githubusercontent.com/assets/5275384/5446280/86fe3bc2-8471-11e4-838b-d7a5ca65a167.png)