code: function scale(progress) {
    var to = (this.options.to !== undefined) ? this.options.to : 1;
    var from = (this.options.from !== undefined) ? this.options.from : this.transforms.scale[0];
    var scale = (to - from) * progress + from;
  
    this.transforms.scale[0] = scale;
    this.transforms.scale[1] = scale;
  }
docs: Uniformly scale an element along both axis'.
  @param {Float} progress  Current progress data of the scene, between 0 and 1.
  @this {Object}
  @return {void}