Fix sizing problem
Fix sizing problem

It appears that we get slightly off sizing information from Safari and
Firefox under some circumstances. Since the sizes are slightly off some
text is hidden due to overflow. This change adds 1 pixel to the width
which is sufficient to remove the overflow for the cases I've tested.

9n/dagre-d3,dagrejs/dagre-d3,cpettitt/dagre-d3,cbfx/dagre-d3,git-ashish/dagre-d3,git-ashish/dagre-d3,cbfx/dagre-d3,cpettitt/dagre-d3,dagrejs/dagre-d3,dominiek/dagre-d3,cpettitt/dagre-d3,ENCODE-DCC/dagre-d3,dominiek/dagre-d3,git-ashish/dagre-d3,9n/dagre-d3,cbfx/dagre-d3,9n/dagre-d3,dominiek/dagre-d3,ENCODE-DCC/dagre-d3