Makefile cleanup a la graphlib
Makefile cleanup a la graphlib

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