Document how to store multidim matrices/volumes in row major format

[psteinb]

Hi,
first off, thanks for providing such a high quality implementation of HDF5 with julia. I am working on a project where we need to store a 3D matrix in a .h5 file in such a fashion, that it can be consumed by python libraries. The HDF5.jl documentation currently only describes how to read nD "arrays" that have been stored in row major. I currently require the reverse and hence would appreciate a comment on this in the docs as I perceive myself as a julia beginner.
Thanks.

[psteinb]

See also https://github.com/JuliaIO/HDF5.jl/blob/master/docs/src/index.md at the very bottom.