Remove extra space around review stars

The review stars should be equal to the line-height and nothing more. This removes the extra space to just a 1px, which is coming from somewhere else that I'll fix in a separate PR.

Before:
![screen shot 2014-10-17 at 16 01 06](https://cloud.githubusercontent.com/assets/1607666/4681074/f3b4c906-560f-11e4-8351-0f8e500e0197.png)

After:
![screen shot 2014-10-17 at 16 00 36](https://cloud.githubusercontent.com/assets/1607666/4681075/f5043af8-560f-11e4-9c6a-3ecf053a0b02.png)