Took theta out of the past weight values in OutputNeuron. Added learning
comments to HiddenNeuron. Adjusted changeDelta() in HiddenNeuron so that
it could work with multiple outputs. Now I need to test this. (Since I
only ever tested this with 2 input logic functions, this was never a
problem...).

Signed-off-by: TexasTony <tknapp@conncoll.edu>