Make it a bit nicer at smaller browser sizes

Basically my use case for this is when using capsule side by side with other applications on the same screen.

As a personal baseline, I wanted it to feel better to use if vertically split screening two applications on a 13" MBA screen, so a browser reduced to half that screen space.

This is just a running start at this, but thought feedback along the way would be good.

Definitely a few edge cases still to address.

This branch takes us from here.

![2013-06-21 at 11 27 46 am](https://f.cloud.github.com/assets/401520/688477/f5c67fae-da97-11e2-82df-001cf34f96d3.png)

To Here

![2013-06-21 at 11 28 46 am](https://f.cloud.github.com/assets/401520/688485/1adf50e0-da98-11e2-8b1a-f6234da288f0.png)