Token Vision fixes
Fix incorrect shading for terrain for token vision LOS when webGL shadows are enabled. Closes issue #90. Thanks @demonkiller89!
Handle error when deleting walls.
Fix for token vision seeing through walls as tokens are moved around the scene. Closes issue #88.
Treat infinite light sources as elevation near integer maximum instead of setting to 0. Closes issue #89.
Update geometry lib to 0.2.11.