Updated most em values so we can allow Sass to do the math, rather than us having to do it outside of Sass.

Note: a handful of these *weren't* changed due to the fact that they aren't based on a root of 16, but instead a root of their parent selector's font-size.

For example:

h1
	font-size: (32em/16)
	margin: 1em 0 .1em <------ These margins aren't ".1em of 16", but instead ".1em of 2em/32px" via the result of the font-size value.