First stab at node merging, not testing at all yte.
Make node merging work...I think.
Finish adding merging tests + fix a few bugs.
Add gitignore, remove pyc file
Try to enable node merging...but it's causing huge graphs for some reason?
Fix merging a bit by using sets instead of lists when comparing.
Fix node merging to stop losing edges.
Finish verifying node merging. No known bugs anymore.