2-column availabilities (front-page) view

* Less scrolling
* More obvious that it's different content

Uses media queries to break to the old format for "mobile" view

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This was a personal preference. I didn't like that this information can be way below the fold. Plus, once you scroll, it's not immediately obvious that appointments are different than availabilties.

Here's what it looks like:

![screen shot 2013-09-27 at 3 26 53 pm](https://f.cloud.github.com/assets/202/1229181/5d279f1c-27b3-11e3-9f47-e3354c0d1ca3.png)