s/arrow/arrows and s/shape/shapes
Support for padding and other attributes
Refactor how SVG styles are applied, collapse shapes / arrows
Misc fixes + update tcp-state-diagram
Pick up new graphlib release
Tweak arrow sizes
Drop some obsolete demos
Fix rounded corners
Simplify and extract zoom
Add back sentence tokenization + support for classes
Convert hover demo
Update style-attrs example
Fixup etl-status

Still some work to do on this one. It would be nice to remove the jitter
with either a min width or fixed width between ranks.
Demo shapes and arrowheads
Add demo showing how to customize shapes and arrows
Remove old renderer