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.
@jni I should have known you wouldn't believe me the first time around :)

http://wiki.scipy.org/FAQ#head-ef4eeddf7ff734c34a80b95901b5049d699be959