refs #198 fixed DOM traversal to use the offset parent since we are calculating offsets
refs #198 fixed DOM traversal to use the offset parent since we are calculating offsets

KonstantinShemyak/cytoscape.js,rlugojr/cytoscape.js,cytoscape/cytoscape.js,rlugojr/cytoscape.js,soomin-maeng/cytoscape.js,KonstantinShemyak/cytoscape.js,cytoscape/cytoscape.js,soomin-maeng/cytoscape.js