v3.2.0 post and redesign

![screen shot 2014-06-26 at 2 38 27 am](https://cloud.githubusercontent.com/assets/98681/3396875/d4e51b1e-fd15-11e3-96eb-048bb20494ba.png)

That old header was bothering me, so I nuked it and moved over to some Poole stuff. New header, new styles (back to `rem`s for sizing), larger videos, and more. Plus, the v3.2.0 post.

For the release post the goal was highlight several things and not really cover everything. If I've missed something awesome, let me know though—I'd love to show off a bit more given how long this post has taken.

/cc @cvrebert @juthilo
"Youtube" -> "YouTube"? Only mentioning it, because it's the only thing that's not perfect in this draft. :smile: