Themed wizard-bar

Added a border radius to the first and last elements, plus made the current step more prominent.

**Before**
![before](https://cloud.githubusercontent.com/assets/665387/5545214/a63d5ec2-8ae9-11e4-9b82-05bd153b4f0b.png)

**After**
![after](https://cloud.githubusercontent.com/assets/665387/5545216/a8474e30-8ae9-11e4-8b2e-8cd08f28bb77.png)