implement a better method for vtk data serialization
implement a better method for vtk data serialization

The previous implementation required a VTK version that was newer than
what was provided on Ubuntu 14.  This new implementation is better and
supports older VTK.

mithrandir123/director,RobotLocomotion/director,edowson/director,RussTedrake/director,RussTedrake/director,rdeits/director,empireryan/director,manuelli/director,mitdrc/director,RobotLocomotion/director,gizatt/director,openhumanoids/director,empireryan/director,edowson/director,gizatt/director,gizatt/director,RussTedrake/director,mitdrc/director,RussTedrake/director,empireryan/director,manuelli/director,patmarion/director,rdeits/director,RobotLocomotion/director,openhumanoids/director,mithrandir123/director,RobotLocomotion/director,mithrandir123/director,edowson/director,rdeits/director,empireryan/director,manuelli/director,openhumanoids/director,RussTedrake/director,mitdrc/director,manuelli/director,empireryan/director,mithrandir123/director,rdeits/director,patmarion/director,mitdrc/director,edowson/director,gizatt/director,patmarion/director,edowson/director,mitdrc/director,openhumanoids/director,rdeits/director,manuelli/director,openhumanoids/director,gizatt/director,mithrandir123/director,patmarion/director,RobotLocomotion/director,patmarion/director