Modified find VTK to include a hit of where to find it. Necessary for OSX homebrew.
Modified find VTK to include a hit of where to find it. Necessary for OSX homebrew.

manuelli/director,manuelli/director,mitdrc/director,manuelli/director,openhumanoids/director,mitdrc/director,manuelli/director,mitdrc/director,patmarion/director,patmarion/director,openhumanoids/director,openhumanoids/director,patmarion/director,mitdrc/director,manuelli/director,patmarion/director,openhumanoids/director,openhumanoids/director,mitdrc/director,patmarion/director