added back in png support
added back in png support

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