Put a grid of thumbnails on the examples page

The grid is going to look like this:
![Thumbnail grid](http://f.cl.ly/items/0W302l2y1P0v2R3a091u/Screen%20Shot%202014-02-14%20at%2015.53.43.png)

One thing I am not sure of is how to add the css changes to the scss files at `docs/static/sass/package-page.scss`. I added my necessary changes to `docs/static/css/package-page.css` but I am afraid that might be overwritten at some point of the deployment process.

When I tried `rake generate:docs` locally it was not but I am not sure other steps during the deployment process leave the css intact.

@JoshEngebretson My guess is that you know about this, so please don't merge this PR until this is settled. I am happy to apply my changes to the scss file or leave it as is now if you tell me there is no css generation/copying going on at deployment.