Minor fix: use node id not label for node class
Minor fix: use node id not label for node class

cbfx/dagre-d3,rwl/graphlib_dot,rwl/dagre_charted,abduld/dagre,9n/dagre-d3,lmcorbo/dagre,cpettitt/dagre-d3,cpettitt/dagre-d3,git-ashish/dagre-d3,GerHobbelt/dagre,tylingsoft/dagre-layout,kdawes/dagre,rwl/dagre,dagrejs/dagre-d3,ENCODE-DCC/dagre-d3,dagrejs/dagre-d3,lmcorbo/dagre,9n/dagre-d3,cpettitt/dagre,git-ashish/dagre-d3,9n/dagre-d3,lmcorbo/dagre,cpettitt/graphlib-dot,GerHobbelt/dagre,cpettitt/dagre,cpettitt/dagre-d3,leMaik/graphlib-dot,witcxc/dagre,ENCODE-DCC/dagre-d3,cbfx/dagre-d3,shelsonjava/dagre,tylingsoft/dagre-layout,9n/dagre,dominiek/dagre-d3,cpettitt/dagre,witcxc/dagre,GerHobbelt/dagre,kdawes/dagre,rwl/dagre_charted,rwl/dagre_charted,abduld/dagre,shelsonjava/dagre,leMaik/graphlib-dot,shelsonjava/dagre,dominiek/dagre-d3,abduld/dagre,cpettitt/graphlib-dot,harsha-mudi/dagre-d3,kdawes/dagre,9n/dagre,harsha-mudi/dagre-d3,9n/dagre,dominiek/dagre-d3,cbfx/dagre-d3,git-ashish/dagre-d3