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

[Ryan Curtin]

> In this case, there would be nine parameters to pass in, I would suggest turn ColumnsToBlocks to a class

I could agree with this.  I'm not sure where the best place to put that class would be... maybe `mlpack/core/math/`?  I'd say (unless you have a better idea), either leave it with the `sparse_autoencoder` code, or toss it in `mlpack/core/math/`.

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