Adding a puzzler definition to the home page

Prompted by [this comment](https://github.com/scalapuzzlers/scalapuzzlers.github.com/pull/109#issuecomment-49697099)

Current:

![image](https://cloud.githubusercontent.com/assets/223702/3661632/9618108c-11c2-11e4-83b3-93e06262c469.png)

New:

![image](https://cloud.githubusercontent.com/assets/223702/3661630/8d7ceb64-11c2-11e4-87d5-3140b9900c01.png)

Note: the first formatting commit is really separate from the functional commit and probably could be committed while this one is still in review. Just want to make sure we're not breaking the Javascript...