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.
@ahojnnes @emmanuelle @stefanv official numpy doc:

http://docs.scipy.org/doc/

Throughout the docs, both forms can be found. I really prefer the non-capitalised version because it's much less annoying to type! So I would rather promote that.