[WIP] Implementing Nelder-Mead method.

include/4neuro.h

src/CMakeLists.txt

src/LearningMethods/GradientDescentBB.cpp

src/LearningMethods/NelderMead.cpp

src/LearningMethods/NelderMead.h

src/LearningMethods/ParticleSwarm.cpp

src/examples/dev_sandbox.cpp