Fix the twitter bootstrap

You skipped this section in Splurty Lesson 7.

![screen shot 2014-11-30 at 2 44 55 pm](https://cloud.githubusercontent.com/assets/233615/5239041/83f003e4-789f-11e4-9c66-acd1793b01a7.png)

This code adds it.  I'll follow up with how to deal with these GitHub messages over email.