Restored reference-data submodule to https protocol
Added %export_magic to replace deprecated export_notebook function
Expanded the .gitignore list
Updated docbuilder submodule reference
Add compatibility with PatternCoordinator from ImaGen
Some Pseudocode how Early Vision class might end looking like
Rename SynthesizeFn to ValueCoordinator
Change seed to match Gaussian in gcal.ty
Split ImaGen and Topographica part