prevent animation from searching forever for next key. When next key has lower index than prev, we have looped, and expect the time value to be less then the current
some light cleanup
fixing collada examples on github
Added performance improvement ideas

Removed and added some comments
Fleshed out Box3 docs. Added optionalTarget parameter to both box's .getParameter()
Merge branch 'doc_updates' of https://github.com/TatumCreative/three.js into dev
Merge branch 'master' of https://github.com/zz85/three.js into dev
Merge branch 'fixing-collada-examples-on-github' of https://github.com/danielribeiro/three.js into dev
Merge branch 'animationHang' of https://github.com/rchadwic/three.js into dev
Animation: Some more clean up.
Updated builds.
Fix typo getNormalVector() -> getTangent()