Major changes:
- Allow SimpleNetwork to take Layers
- initialize() checks inputs for color; make_image() respects it
- Raise an error for malformed SimpleNetwork layer representation
- Use a input_dataset in predict_to
- fix display_colormaps()
- Added network.propagate(show=False)
- Initialize limits with first generation of image
- Syntax of setup requires
- Use "Flatten" rather than 0
- allow tolerance as kwarg to fit()