Geoff:> No implementations yet
	modified:   Neurons/Brain.h
	modified:   Neurons/Connection.cpp
	modified:   Neurons/Connection.h
	new file:   Neurons/InputNeuron.h
	modified:   Neurons/Neuron.h
	new file:   Neurons/OutputNeuron.h
	modified:   Neurons/Signal.cpp
	modified:   Neurons/Signal.h