Fix Billboard.computeScreenSpacePosition#3976

Merged

pjcozzi merged 3 commits intomasterfrom billboard-screen-space-position

May 30, 2016

+6-8

Commits on May 27, 2016

Swap screen space position y coordinate so it increases from top to bottom. Also fix the calculation in 2D for labels.
bagnell
committed

Commits on May 28, 2016

Update CHANGES.md.
bagnell
committed

Commits on May 30, 2016

Merge master to billboard-screen-space-position
pjcozzi
committed