fix punctuation selector for rgb values

fixes #27 

Somehow somewhere the braces around # must've gone missing, because the capture was already there.

![screen shot 2014-12-03 at 22 37 01](https://cloud.githubusercontent.com/assets/2543659/5289299/f19ee26c-7b3c-11e4-8c0b-fc61babeed03.png)