simplified weight_decay for Parameter
So far, I have used only L2 regularization. If other kinds of
regularization is needed, we should consider making the penalty
abstraction more flexible - or just let the user create a new
Parameter subclass.
more consistent examples
fixed check_bprop
moved monitor functionality to Parameter from LearningRule
renamed Parameter.values to Parameter._array
moved logger configuration to base
This avoids polluting the deeppy namespace.