Add some CSS love to the issues tracker

v0 vs v2:
![bedrock-issues-v0_vs_v2-1](https://f.cloud.github.com/assets/1591486/793677/5bc31bb4-ec2c-11e2-8301-87260cbb5e64.png)
![bedrock-issues-v0_vs_v2-2](https://f.cloud.github.com/assets/1591486/793678/5bc76098-ec2c-11e2-93d1-846dc88cc58e.png)
![bedrock-issues-v0_vs_v2-3](https://f.cloud.github.com/assets/1591486/793679/5bc7b840-ec2c-11e2-8efc-92e7c034766d.png)