Report styling fix

Fixed yellow background issue in css; adding missing column header in column styles preview; cleaned up code

https://bugzilla.redhat.com/show_bug.cgi?id=1134745

Before:
![screen shot 2014-09-02 at 5 06 45 pm](https://cloud.githubusercontent.com/assets/1287144/4125801/2022a470-32e5-11e4-8cf8-001d8f770091.png)

After:
![screen shot 2014-09-02 at 5 09 30 pm](https://cloud.githubusercontent.com/assets/1287144/4125814/5a41422e-32e5-11e4-8adc-14d7ae121986.png)