Root Cases has introduced its new line of wooden cases for the iPhone 4. Available in walnut, zebrawood, wenge, and bamboo editions, the cases offer push-through protection for the volume and sleep/wake buttons, open access to all other ports and controls, soft interior lining to protect against scratches, and a slide-on design that allows for removal of the bottom portion for docking. Root Cases’ wooden cases for iPhone 4 are available…