Rewrite the bookmarklet to use cssbeautify and Prism

Inlined both to make the bookmarklet fast.

Used cssbeautify instead since it's more tolerant for edge cases and actively maintained.

![Screen Shot 2013-03-14 at 19 58 40](https://f.cloud.github.com/assets/170270/260597/52ef4218-8cd9-11e2-9dd7-41e3315113d2.png)