Remove materials that are being moved to a plugin.
Fix test.
Update CHANGES.md.
Remove more instances of removed materials.
Update Sandcastle example images.
Merge branch 'master' into remove-materials
Merge pull request #1382 from AnalyticalGraphicsInc/remove-materials

Remove materials
Merge remote-tracking branch 'origin/master' into tilePlanes

Conflicts:
	CHANGES.md