Updated to new version of rainbowJS with CSS syntax bug fix

There was a bug with the css syntax highlighting of hex color values:

![rainbows css syntax bug](https://f.cloud.github.com/assets/2257156/433866/42bc492a-aefa-11e2-9dea-37bfde9cf3d0.png)

It was resolved in the most recent version:
https://github.com/ccampbell/rainbow/issues/125