Started with a demo of user-defined node shapes
Started with a demo of user-defined node shapes

Not yet done: looks perfect when rendered with Rascal, but not so
perfect when pasted in an HTML page.
9n/dagre-d3,rwl/dagre_charted,rwl/dagre_charted,git-ashish/dagre-d3,dominiek/dagre-d3,rwl/dagre_charted,dagrejs/dagre-d3,ENCODE-DCC/dagre-d3,ENCODE-DCC/dagre-d3,git-ashish/dagre-d3,cpettitt/dagre-d3,dominiek/dagre-d3,dominiek/dagre-d3,9n/dagre-d3,cbfx/dagre-d3,9n/dagre-d3,cpettitt/dagre-d3,dagrejs/dagre-d3,cbfx/dagre-d3,git-ashish/dagre-d3,cbfx/dagre-d3,cpettitt/dagre-d3