[ADD] added a new pair of learning methods

include/4neuro.h

run_test.sh

src/CMakeLists.txt

src/DataSet/DataSet.cpp

src/DataSet/DataSet.h

src/ErrorFunction/ErrorFunctions.cpp

src/ErrorFunction/ErrorFunctions.h

src/LearningMethods/NormalizedGradientDescent.cpp

src/LearningMethods/NormalizedGradientDescent.h

src/LearningMethods/SmoothingLearning.cpp

src/LearningMethods/SmoothingLearning.h

src/Network/NeuralNetwork.cpp

src/Network/NeuralNetwork.h

src/examples/acsf.cpp