[mlpack-git] [mlpack] ANN Saving the network and reloading (#531)

[stereomatchingkiss]

>just return net (which is the FFN) and saved it to another auto'd variable from main.

Like theSundayProgrammer said, if you create your net by std::tie, the type of your net would take the reference of the layers, but not copy/move the layer(remember to define ARMA_USE_CXX11, else the matrix of armadillo cannot move). Return reference of the stack is not a good idea, because the stack will be destroy after you exit from scope. 

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