[mlpack-git] [mlpack] improve speed of SparseAutoencoder and make it more flexible (#451)

[Marcus Edel]

No need to write another test for the forward and backward function, if the existing sparse autoencoder test works with the new code it's absolutely fine. I guess ```sparse_autoencoder_test_2.cpp``` is the modified test and we can remove the ```sparse_autoencoder_test.cpp``` file and rename the other test.

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https://github.com/mlpack/mlpack/pull/451#issuecomment-174206087
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