fix bug with sequence display: the last bases on a ref seq were not displaying correctly
fix bug with sequence display: the last bases on a ref seq were not displaying correctly

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