Danielle, the colon here is messing up this page.  Jekyll uses colons to read data, so it gets confused.  You can put the title in quotes instead or delete the colon.

Make sure you're checking your gh-pages site, not just the commit:
http://daniellewingler.github.io/fall2013/

The way to see this site is : 
[username].github.io/fall2013

So mine is:
eah13.github.io/fall2013

You should preview this for each pull request because the Commit will render the markdown but the github.io site renders the Jekyll