Added book ratings

![ratings](https://cloud.githubusercontent.com/assets/7677641/5070258/e6d792da-6e75-11e4-94cb-7f3713d1484b.jpg)

don't use inline styles
put it into the stelesheet or even try to use predefined in bootstrap
in this case you can just b]wrap it with `<b>` tag or add a `text-bold` class