code: function lighten(scale) {
           scale = me.Math.clamp(scale, 0, 1);
           this.glArray[0] = me.Math.clamp(this.glArray[0] + (1 - this.glArray[0]) * scale, 0, 1);
           this.glArray[1] = me.Math.clamp(this.glArray[1] + (1 - this.glArray[1]) * scale, 0, 1);
           this.glArray[2] = me.Math.clamp(this.glArray[2] + (1 - this.glArray[2]) * scale, 0, 1);
           return this;
         }
docs: Lighten this color value by 0..1
  @name lighten
  @memberOf me.Color
  @function
  @param {Number} scale
  @return {me.Color} Reference to this object for method chaining