BackPropagation works!

src/NeuronNetwork/Makefile

@@ -1,4 +1,6 @@
-OBJFILES=./Solution.o ./Problem.o ./Network.o ./Neuron.o ./FeedForward.o ./FeedForwardQuick.o
+OBJFILES= Neuron.o ./Network.o FeedForward.o FeedForwardQuick.o \
+	Learning/Supervised.o Learning/Unsupervised.o Learning/Reinforcement.o Learning/BackPropagation.o \
+	./Solution.o ./Problem.o
 
 LIBNAME=NeuronNetwork
 
@@ -18,4 +20,4 @@ $(LIBNAME).a: $(OBJFILES)
 	nm --demangle $(LIBNAME).a > $(LIBNAME).nm
 
 clean:
-	@rm -f ./*.o ./*.so ./*.a ./*.nm
+	@rm -f ./*.o ./*.so ./*.a ./*.nm ./*/*.o