Added distanceSquared to Cartesian2, Cartesian3, and Cartesian4
Doc tweaks
Doc tweak
Start of multiplyByMatrix3
Optimizations
Added doc
Merge master to mat3
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
Merge pull request #2294 from AnalyticalGraphicsInc/mat3

Added Matrix4.multiplyByMatrix3
Merge remote-tracking branch 'origin/master' into gfx