Heading in the right direction with its latest version of Wrangler ($50-$60), IvySkin has used the iPhone 5's release to markedly slim down and clean up its earlier hard plastic and glass case design. The new Wrangler boasts MIL-STD 810G weatherproofing, sealed controls and ports, and a touch-through glass screen cover -- now polarized and anti-glare -- as well as a slide-off rear panel that in the future will be able to accommodate an optional battery…