Added return to CompositePrimitive.add
Polygon doc and examples
Fast tests by default
Fix JSHint
Changes after review.
Fix test
Fix markdown formatting
Merge branch 'materials' into moon
Merge pull request #1182 from AnalyticalGraphicsInc/materials

Materials
Merge master to polish
Add tests.
Minor doc fix.
Merge pull request #1187 from AnalyticalGraphicsInc/polish

Hackathon polish
Merge branch 'master' into moon