NN: Create the structure to add a sigmoid lookup table (ROM memory)
NOT WORKING: Programmin tool can´t deploy to selected device, due memory problems
	TODO: Reduce size of sigmoid memory
SIGMOID: Implement a smaller sigmoid dataset, now compiles fine
SIGMOID: Try to implement the DATA_READY SIGNAL (keep it as a comment)
NN: Recalculate: Weights in order to prevent saturation
Merge branch 'sigmoid'