Build a full screen Android Wear app

Current Android Wear experience is limited to notifications. However, we can provide a better full screen experience by building an Android Wear app. This FullScreenActivity shows a pannable (scroll and fling including edge effects) full screen image of the current artwork with the ability to tap to display a card with the artwork title and byline (and tap again to hide).

It slightly shrinks the artwork so that you can pan in at most one direction (i.e., the longer of the two dimensions of the image) rather than a great deal in one direction and a small bit in the other direction.

NOTE: As a result of this change, images sent to Wearable devices are no longer cropped.