Add class to tags layout in order it looks like a bootrstap label

This pull changes the way we see tags. Instead of just links, now they will look like Bootstr
ap Badges. See attached image: 
![label](https://f.cloud.github.com/assets/1375475/236138/5526ab92-87da-11e2-87cc-58bfecf9b9c3.png)