TwelveSouth has released the iPhone 6 and iPhone 6 Plus versions of its signature BookBook case. As with prior versions, the new BookBook for iPhone 6 & 6 Plus ($60) combines a wallet and iPhone protection into a single, classic-looking leather book design. The new version also now adds a removable, sturdy shell case, however, allowing users to easily remove their iPhone from the wallet and carry it separately without losing protection. A hands-free…