Orthographic camera and formatting in the README

I couldn't get the playback working in my local clone for some reason, but I think the THREE.js Orthographic camera is a better fit in this context. See image for the result:

![screen shot 2014-05-27 at 9 29 50 pm](https://cloud.githubusercontent.com/assets/141850/3099580/52bce55e-e5ff-11e3-88a3-6c211f22b4b5.png)