clean up stray svg rects using the chart's domNode, seems to be more reliable in different browsers
clean up stray svg rects using the chart's domNode, seems to be more reliable in different browsers

SuLab/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,limeng12/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,GreggHelt2/apollo-test,GreggHelt2/apollo-test,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,limeng12/jbrowse,GMOD/jbrowse,SuLab/jbrowse,GreggHelt2/apollo-test,erasche/jbrowse,limeng12/jbrowse,SuLab/jbrowse,SuLab/jbrowse,erasche/jbrowse,erasche/jbrowse,GreggHelt2/apollo-test,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,erasche/jbrowse,SuLab/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,GreggHelt2/apollo-test,limeng12/jbrowse,limeng12/jbrowse,GMOD/jbrowse,SuLab/jbrowse,GreggHelt2/apollo-test,igemsoftware/Shenzhen_BGIC_0101_2013,erasche/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,nathandunn/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,Arabidopsis-Information-Portal/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,GMOD/jbrowse,Arabidopsis-Information-Portal/jbrowse,GreggHelt2/apollo-test,SuLab/jbrowse,erasche/jbrowse,nathandunn/jbrowse