FIX: fixed memory leaks

CMakeLists.txt

src/ErrorFunction/ErrorFunctions.cpp

src/ErrorFunction/ErrorFunctions.h

src/LearningMethods/GradientDescent.cpp

src/LearningMethods/GradientDescent.h

src/LearningMethods/GradientDescentBB.cpp

src/LearningMethods/GradientDescentBB.h

src/LearningMethods/GradientDescentSingleItem.cpp

src/LearningMethods/GradientDescentSingleItem.h

src/LearningMethods/LearningMethod.h

src/LearningMethods/LearningSequence.cpp

src/LearningMethods/LearningSequence.h

src/LearningMethods/LevenbergMarquardt.cpp

src/LearningMethods/LevenbergMarquardt.h

src/LearningMethods/ParticleSwarm.cpp

src/LearningMethods/ParticleSwarm.h

src/LearningMethods/RandomSolution.cpp

src/LearningMethods/RandomSolution.h

src/Network/NeuralNetwork.cpp

src/Network/NeuralNetwork.h