mrdoob/three.js — pull request #2768 by bhouston (2012-12-07 14:45:16+00:00)
Title: adopt simplified Box2,Box3 constructor + update tests...

and also make Triangle.normal also available as a static (easy consistent normal generation.)

In response to @mrdoob's suggestion here: https://github.com/mrdoob/three.js/commit/b5786bbe06f2299a806f91aa5d66c3a25e21f5c2#commitcomment-2268959