Implement SvgTurtle.dot() for #274.
Implement SvgTurtle.dot() for #274.

brandm/live-py-plugin,donkirkby/live-py-plugin,donkirkby/live-py-plugin,donkirkby/live-py-plugin,brandm/live-py-plugin,brandm/live-py-plugin,brandm/live-py-plugin,donkirkby/live-py-plugin,brandm/live-py-plugin,donkirkby/live-py-plugin