Removed dangling references when picking
Merge branch 'master' into leak
Merge branch 'master' into leak
Merge branch 'master' into leak
Merge branch 'master' into leak
Merged master to leak
Merge branch 'master' into leak
Merge remote-tracking branch 'origin/master' into leak
Merge branch 'master' into leak
Merge branch 'master' into leak
Picking JavaScript improvements
Fix ellipsoid picking
Added ellipsoid picking test for alpha = 0
Updated CHANGES.md
Moved Noise to BuiltinFunctions.  Added material-correct picking to Polygon
Added generic function for creating fragment shaders for picking
Added material-correct picking to polylines
Add material-aware picking to sensors
Added help to shader cache
Updated CHANGES.md