Fixed bug with negative extents.
Fixed bug with negative extents.

daviddoria/PointGraphsPhase1,sgh/vtk,sumedhasingla/VTK,biddisco/VTK,keithroe/vtkoptix,biddisco/VTK,gram526/VTK,johnkit/vtk-dev,mspark93/VTK,candy7393/VTK,sankhesh/VTK,cjh1/VTK,SimVascular/VTK,johnkit/vtk-dev,sankhesh/VTK,gram526/VTK,Wuteyan/VTK,aashish24/VTK-old,jmerkow/VTK,cjh1/VTK,jmerkow/VTK,gram526/VTK,gram526/VTK,ashray/VTK-EVM,collects/VTK,ashray/VTK-EVM,keithroe/vtkoptix,johnkit/vtk-dev,SimVascular/VTK,sankhesh/VTK,candy7393/VTK,naucoin/VTKSlicerWidgets,arnaudgelas/VTK,sankhesh/VTK,candy7393/VTK,spthaolt/VTK,daviddoria/PointGraphsPhase1,keithroe/vtkoptix,sumedhasingla/VTK,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,collects/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,candy7393/VTK,ashray/VTK-EVM,cjh1/VTK,SimVascular/VTK,aashish24/VTK-old,mspark93/VTK,johnkit/vtk-dev,naucoin/VTKSlicerWidgets,candy7393/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,keithroe/vtkoptix,aashish24/VTK-old,keithroe/vtkoptix,SimVascular/VTK,ashray/VTK-EVM,msmolens/VTK,demarle/VTK,arnaudgelas/VTK,sumedhasingla/VTK,collects/VTK,johnkit/vtk-dev,msmolens/VTK,Wuteyan/VTK,sankhesh/VTK,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,biddisco/VTK,jeffbaumes/jeffbaumes-vtk,msmolens/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,hendradarwin/VTK,arnaudgelas/VTK,SimVascular/VTK,msmolens/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,keithroe/vtkoptix,collects/VTK,sankhesh/VTK,keithroe/vtkoptix,collects/VTK,arnaudgelas/VTK,berendkleinhaneveld/VTK,jeffbaumes/jeffbaumes-vtk,jmerkow/VTK,collects/VTK,jeffbaumes/jeffbaumes-vtk,jmerkow/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,hendradarwin/VTK,msmolens/VTK,sumedhasingla/VTK,Wuteyan/VTK,candy7393/VTK,hendradarwin/VTK,sgh/vtk,spthaolt/VTK,demarle/VTK,jmerkow/VTK,demarle/VTK,jmerkow/VTK,biddisco/VTK,sankhesh/VTK,arnaudgelas/VTK,daviddoria/PointGraphsPhase1,cjh1/VTK,ashray/VTK-EVM,SimVascular/VTK,johnkit/vtk-dev,spthaolt/VTK,mspark93/VTK,sumedhasingla/VTK,mspark93/VTK,aashish24/VTK-old,cjh1/VTK,naucoin/VTKSlicerWidgets,jeffbaumes/jeffbaumes-vtk,cjh1/VTK,arnaudgelas/VTK,spthaolt/VTK,msmolens/VTK,Wuteyan/VTK,mspark93/VTK,candy7393/VTK,msmolens/VTK,SimVascular/VTK,spthaolt/VTK,biddisco/VTK,ashray/VTK-EVM,gram526/VTK,jeffbaumes/jeffbaumes-vtk,berendkleinhaneveld/VTK,gram526/VTK,gram526/VTK,spthaolt/VTK,ashray/VTK-EVM,sgh/vtk,Wuteyan/VTK,gram526/VTK,ashray/VTK-EVM,Wuteyan/VTK,mspark93/VTK,jmerkow/VTK,jmerkow/VTK,hendradarwin/VTK,naucoin/VTKSlicerWidgets,jeffbaumes/jeffbaumes-vtk,berendkleinhaneveld/VTK,spthaolt/VTK,hendradarwin/VTK,biddisco/VTK,naucoin/VTKSlicerWidgets,demarle/VTK,mspark93/VTK,demarle/VTK,demarle/VTK,sgh/vtk,johnkit/vtk-dev,sgh/vtk,Wuteyan/VTK,daviddoria/PointGraphsPhase1,msmolens/VTK,candy7393/VTK,aashish24/VTK-old,aashish24/VTK-old,biddisco/VTK,sgh/vtk,hendradarwin/VTK,demarle/VTK,mspark93/VTK