Updated documentation.
Added support to read/write n-dimensional arrays from rmatio package.

It's now possible to write an n-dimensional array
write.mat(list(a=array(seq_len(32^3), c(32, 32, 32))), 'a.mat')
Updated version to 0.0.4
Merge branch 'master' of https://github.com/stewid/rmatio

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