Added options to change antialiasing on rendererWindow (closes #50).
Added options to change antialiasing on rendererWindow (closes #50).

Also set default to 2.

Uses SetAAFrames on vtkRenWin; this might not be the best way.
chrisdjscott/Atoman,chrisdjscott/Atoman,chrisdjscott/Atoman,chrisdjscott/Atoman,chrisdjscott/Atoman