issue/2057-drawer-tweaks

Fix #2057 - adjusted drawer margins (keylines) and sizing to more closely match [the specs](http://www.google.com/design/spec/patterns/navigation-drawer.html). Also added a divider under notifications and removed the gray background from settings.

![drawer_wordpress](https://cloud.githubusercontent.com/assets/3903757/5297154/07e07c38-7b7a-11e4-8836-e8b3b8a81b6e.png)