March ray ellipsoid intersection for oblate ellipsoids.
Merge branch 'master' into ellipsoidPrecision
Merge branch 'master' into ellipsoidPrecision
Update based on review.
Update CHANGES.md.
Merge branch 'master' into ellipsoidPrecision

Conflicts:
	CHANGES.md
Merge pull request #1067 from AnalyticalGraphicsInc/ellipsoidPrecision

Ellipsoid precision