WIP: Describe array order terminology in 2D, 2D+c, 3D, 3D+c arrays

Still working on it, but just thought I'd check this in so that we can tag it as 0.11.
​Other than in the outline, I'm afraid it's known as "NumPy" everywhere:

http://docs.scipy.org/doc/numpy-dev/dev/

So, either use "numpy" as the package name or "NumPy" as the project name.