Only weeks after unveiling BookBook for iPhone 5, Twelve South is back at it again with BookBook for iPad mini ($70). This edition is really just a shrunken-down version of BookBook for full-sized iPads; it's almost identical in every way. From the outside, it resembles a hand-crafted leather-bound book, and is just as beautiful as the rest of the line. The tablet fits in a leather holder attached to the inside cover on the right, with snaps holding…