Changes to introductory heading and sentence

Before:
![screen shot 2014-11-01 at 11 51 34 am](https://cloud.githubusercontent.com/assets/8854342/4872322/1738159c-61df-11e4-87cd-390c73409b76.png)

After:
![screen shot 2014-11-01 at 12 08 32 pm](https://cloud.githubusercontent.com/assets/8854342/4872339/613ca296-61e1-11e4-9dee-5fea0c7c9f85.png)