Add example code demonstrating how to rotate in the x,y,z axes using ClutterState. Integrated with build.
Currently, it's just an example and an image, but it should be easy to flesh it out properly for the "Text" chapter.
The cookbook should also include fully functional code examples. We can even XInclude them into the docbook XML itself. The examples should be built with the coobook, so that we can always make sure they are up to date.
