Fully working Vertex > Vertex syntax for Edge class specification.
Better testing and solid docstrings/cleanup for new model classes.
Reformatting files to fit 80-character width limit. Also general cleanup and nit fixes.
Simple bugfixes for tests, initial framework to support dispatching full request flows from tests, full testing coverage and support (and docstrings) for caching logic.
Cleanup and further alignment fixes.
Re-adding 'Cache' interface method 'items', as it is used in plenty of important places that I obviously didn't have time to think of.