pretty up registration page

Put registering a new user side-by-side with checkout as guest. Before & After Screenshot attached:

After:
![screen shot 2014-04-28 at 5 53 20 pm](https://cloud.githubusercontent.com/assets/852746/2823524/39b05212-cf20-11e3-9649-787566b8438f.png)

Before:
![screen shot 2014-04-28 at 5 45 17 pm](https://cloud.githubusercontent.com/assets/852746/2823532/478332b0-cf20-11e3-8c58-a2a1b148a677.png)

You can ignore the blue styling in my "Registration." That's from my stylesheet.