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
Merge remote-tracking branch 'origin/master' into pickFixes
Added qualifier
Merged master to models