Added distanceSquared to Cartesian2, Cartesian3, and Cartesian4
Doc tweaks
Doc tweak
Merge master to squared
Tweak CHANGES.md
Merge branch 'master' into squared

Conflicts:
	CHANGES.md
Merge pull request #2293 from AnalyticalGraphicsInc/squared

Added distanceSquared to Cartesian2, Cartesian3, and Cartesian4
Merge branch 'master' into mat3

Conflicts:
	CHANGES.md