code: function(h, s, v) {
  		return this.setHSV([ this.hsv[0] + h, this.hsv[1] + s, this.hsv[2] + v ]);
  	}
docs: Adds the given HSV values as offsets to the current color. Hue will
  automatically wrap.
  
  @param h
  @param s
  @param v
  @return itself