Zagg has announced two new iPad keyboard cases in its lineup combining protection and ease of use for iPad users on the go. The new Nomad Book ($100) features two detachable bumpers so that it can be used with a variety of tablets, including not only the 10.5-inch iPad Pro, but also the older 9.7-inch Pro, 9.7-inch standard iPad, and even older iPad models, and includes multi-device pairing so that the keyboard can be used not only with the associated…