Add user descriptions

## Overview
This pull adds customizable descriptions next to usernames. Closes #331.

## Notes
- I set the max length of descriptions to 32 characters.
- The news page shows the description the username as a title.
- The comments section shows the description next to the username in a stylized element.
- I reordered the information line on posts.  
  
Before: 
> submitted 2 months ago by rickhanlonii from github.com  
  
After:
> submitted 2 months ago from github.com by rickhanlonii, Software Engineer, Updox

## Screens
### Profile
![account_management_-_pullup](https://cloud.githubusercontent.com/assets/2440089/2939018/b47b0bca-d931-11e3-9cf8-619cbf0282fe.png)

### Post/Comments
![github__build_software_better__together__-_pullup](https://cloud.githubusercontent.com/assets/2440089/2939038/ecad0556-d932-11e3-8f4f-00088cb296b9.png)

### News
![screen shot 2014-05-11 at 1 29 47 pm](https://cloud.githubusercontent.com/assets/2440089/2939039/f4ca64b8-d932-11e3-9b50-b69aa6a9bd0e.png)