allow to easily customize radar chart style

I needed to create custom looking radar charts:
![screen shot 2014-07-06 at 23 26 21](https://cloud.githubusercontent.com/assets/410211/3490030/3fa6f58e-0555-11e4-9b52-9d0e7d404fd8.png)
![screen shot 2014-07-06 at 23 26 44](https://cloud.githubusercontent.com/assets/410211/3490031/3fa7130c-0555-11e4-9404-b480cb81bdf7.png)

To do so I separated out the styles from the js file.

Changes:
- radar chart
  - allow to target level lines and axis lines via css
  - move all styles to css rules instead of js inline
  - use css transition for opacity shifts when focusing
- bower
  - avoid forward slash in name (bower interpolates name into paths)
  - declare primary files