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Haskell neural-net: final cleanup

Haskell neural-net: cleanup & abstract out executables

Haskell neural-net: training

Haskell neural-net: regularized backprop & extended xor_xnor example

Haskell neural-net: passes feedForward tests from ML class

Haskell neural-net: regularization & random initialization

Haskell neural-net: reshapeNN, forwardProp, nnCostFunction, xor_xnor network

Haskell neural-net: beginnings