Add tool to create dot graph of VexFlow design.
Add tool to create dot graph of VexFlow design.

Silverwolf90/vexflow,Huji/vexflow,Tails/vexflow,Silverwolf90/vexflow,Tails/vexflow,aaronmars/vexflow,Tails/vexflow,aaronmars/vexflow,Huji/vexflow,Silverwolf90/vexflow,Huji/vexflow,aaronmars/vexflow