Add clearfix divs to Profile Edit->Skills tab.

[11:00:13] &lt;williamr>	 The privacy controls are looking great on mozillians-dev.
[11:01:49] &lt;williamr>	 the placement of the dropdowns on the Edit Skills & Groups section is a bit confusing, since the dropbown almost vertically aligned with the next section below. Adding some whitespace between sections could help, or placing the dropdowns higher up in each section.