/**
 * animation-stepper
 * Javascript library to handle several animations at once using a singleton approach. One window.requestAnimationFrame instance will be running in the background to orchest all animations.
 * @version @@version-number - @@version-date
 * @link https://github.com/ajsoriar/animation-stepper
 * @author Andres J. Soria R. <ajsoriar@gmail.com>
 * @license MIT License, http://www.opensource.org/licenses/MIT
 */