add test cases of modified SparseAutoEncoder
add test cases of modified SparseAutoEncoder

ajjl/mlpack,ranjan1990/mlpack,theranger/mlpack,palashahuja/mlpack,ranjan1990/mlpack,ajjl/mlpack,darcyliu/mlpack,theranger/mlpack,darcyliu/mlpack,ranjan1990/mlpack,palashahuja/mlpack,ajjl/mlpack,palashahuja/mlpack,theranger/mlpack,darcyliu/mlpack