add a button to the bottom right corner to expand all definitions

Based upon [issue #67](https://github.com/camping/camping/issues/67) in the camping repo, I went ahead and created an Expand All button that hangs out in the lower right corner.

![Screen Shot 2013-02-01 at 2 42 14 PM](https://f.cloud.github.com/assets/928367/119494/a928e172-6ca7-11e2-96c1-9254f22b9d21.png)

It is not pretty yet, but it works. When it is clicked, it hides itself.