[mlpack-git] [mlpack] Add leaky ReLUs (#412)

[abhinavchanda]

Hi. Thanks for the suggestions. I have made the required changes [here](https://github.com/abhinavchanda/mlpack/blob/412_leakyReLULayer/src/mlpack/methods/ann/layer/leaky_relu_layer.hpp).Regarding testing I have a doubt. As leakyReLu is a layer, as opposed to a single neuron, so it should have only forwad and backward as public methods and the activation function and derivative should not be exposed, but in tests/activation_functions_test.cpp only activation functions and their derivatives are being tested.

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https://github.com/mlpack/mlpack/issues/412#issuecomment-191624240
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