WIP: Fixed memory errors...

src/LearningMethods/GradientDescent.cpp

src/LearningMethods/GradientDescent.h

src/LearningMethods/LearningSequence.cpp

src/LearningMethods/LearningSequence.h

src/LearningMethods/LevenbergMarquardt.cpp

src/LearningMethods/RandomSolution.cpp

src/LearningMethods/RandomSolution.h

src/examples/simulator.cpp