jeremyckahn/shifty — pull request #22 by millermedeiros (2011-12-21 15:34:25+00:00)
Title: Remove noop callback and step from core, reuse same fn on queue.

There is no need to create a new noop function for each tween if it
isn't going to be called, added checks so it is only called if
available and on queue it reuses same noop function for all calls
if needed.