Add syntax highlighting

Alright! So, I tried a few different methods to accomplish this. Using brucedown takes a whopping 15-20 seconds (or sometimes more) to render. It also seems to hog system resources during that time (on a 2013 MBP I experience lag). I have opted instead to use marked + highlight.js to emulate github syntax highlighting. The only downside that I have seen is *this* method doesn't render code comments correctly (or at least not how github does it). If you would prefer, however, I will use the other method.