Added new Unit_tests

src/CMakeLists.txt

src/LearningMethods/ParticleSwarm.cpp

src/NetConnection/ConnectionWeight.cpp

src/NetConnection/ConnectionWeight.h

src/Neuron/Neuron.cpp

src/Neuron/NeuronLogistic.cpp

src/Neuron/NeuronTanh.cpp

src/Neuron/NeuronTanh.h

src/tests/ConnectionWeightIdentity_test.cpp

src/tests/ConnectionWeight_test.cpp

src/tests/Connection_test.cpp

src/tests/NeuralNetwork_test.cpp

src/tests/NeuronBinary_test.cpp

src/tests/NeuronLinear_test.cpp

src/tests/NeuronLogistic_test.cpp

src/tests/NeuronTanh.cpp

src/tests/ParticleSwarm_test.cpp

src/tests/Particle_test.cpp

src/tests/neuron_test.cpp