Removed margins from ul ul

Much like with my other pull request, I could be barking up the wrong tree here, but I figured, for code such as the example below, this would prevent huge, unneeded, margins on each of the inner lists:

	<ul>
		<li>TV Series
			<ul>
				<li>TV Series DVD</li>
				<li>TV Series Bluray</li>
			</ul>
		</li>
		<li>Movies
			<ul>
				<li>DVD Movies</li>
				<li>Bluray Movies</li>
			</ul>
		</li>
		<li>Games
			<ul>
				<li>PC
					<ul>
						<li>Download from Steam</li>
						<li>Physical Media</li>
					</ul>
				</li>
				<li>Xbox 360</li>
				<li>Playstation 3</li>
			</ul>
		</li>
	</ul>

(Or maybe this should be submitted to the original normalize.css project, I don't know)