[mlpack-git] [mlpack] Create a function to visualize the features learned by sparse autoencoder (#465)

[Ryan Curtin]

I made a few changes to `ColumnsToBlocks`; please let me know if I did anything wrong:

995e0c0..10b9d45

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/465#issuecomment-160678549
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