Switch to normalize.css

As reported in #5, the reset.css used in this theme doesn't allow for inline styling (e.g. bold, italics, etc.). Due to the nature of these older resets, they are pretty overzealous and try to reset every element to have zero styling. Using [normalize.css](http://necolas.github.io/normalize.css/) is a much better way of establishing a baseline style so I've swapped that in.

@pietromenna I'd prefer we go with this over band-aiding the reset styles in #6.