Restyle dropdown subnav

![screenshot](https://f.cloud.github.com/assets/928675/1944490/097106fa-7fbb-11e3-83ee-7100ae7987c0.png)

This is more just a small nitpick, and my proposed solution. Personally, it seems weird in a hover state for the a link's background color to not extend flush to the divider. I propose a change to this in dropping the unnecessary padding and margin declarations, as well as the dividers in Handlebar templates to **compact the dropdown** and **use border-bottom to act as a stylistic divider**.

With restyle:

![screen shot 2014-01-17 at 3 40 24 pm](https://f.cloud.github.com/assets/928675/1944752/041a5cf6-7fc0-11e3-9052-79f6ead66203.png)