Add dot-like serializer
Add dot-like serializer

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