Added patternfly styling to chart highlighter

Issue #976

Before:
![screen shot 2014-12-01 at 1 48 21 pm](https://cloud.githubusercontent.com/assets/1287144/5251126/e31b749a-7960-11e4-9831-13270fef689a.png)
After:
![screen shot 2014-12-01 at 1 30 17 pm](https://cloud.githubusercontent.com/assets/1287144/5251127/e8d46932-7960-11e4-8881-226859a2197c.png)
Patternfly example:
![screen shot 2014-12-01 at 1 30 29 pm](https://cloud.githubusercontent.com/assets/1287144/5251130/ee9882ea-7960-11e4-92dd-264549759202.png)