Added options support to graph.getBBox in order to match the ones of cell.getBBox
Added options support to graph.getBBox in order to match the ones of cell.getBBox

clientIO/joint,clientIO/joint,vtalas/joint,gagaboy/joint,kumilingus/joint,DavidDurman/joint,DavidDurman/joint,vtalas/joint,clientIO/joint,chill117/joint,DavidDurman/joint,chill117/joint,gagaboy/joint,vtalas/joint,kumilingus/joint,chill117/joint,kumilingus/joint,gagaboy/joint,clientIO/joint,kumilingus/joint