adds abbr styling

Fixes #237.

Before: 
![before](https://cloud.githubusercontent.com/assets/1754187/2906094/d5265906-d60c-11e3-8153-a2dd0ab6e1df.png)

After: 
![after](https://cloud.githubusercontent.com/assets/1754187/2906106/0089e72a-d60d-11e3-8e4c-eb6af3c1b8bb.png)