GoodBoyDigital/pixi.js — pull request #659 by ryanmcnz (2014-03-16 10:34:54+00:00)
Title: Implemented animationSpeed for Spine animations.

Default value is 1.
This is simply the "timeScale" value from the Spine runtime, but with a more friendly name.

It allows the user to easily change the playback speed of a Spine animation in Pixi.js.