Restructured the application.

This restructuring was in response to some hard-won advice on how to organize an angular application:

http://www.airpair.com/angularjs/posts/top-10-mistakes-angularjs-developers-make
Merge pull request #14 from SkewedAspect/ccase-structure

Restructured the application.
Started refactoring and implementing the scene manager.
Moved sceneman into content to match the new layout.