If there's one thing that could draw a bit of attention away from yesterday's surprise launch of Temple Run 2, it's a can't-miss deal on an Angry Birds game. In this case, it's news that both the iPhone/iPod touch and iPad versions of Angry Birds Rio -- the mash-up of Rovio's hit foul-flinging title and Fox's 2011 CG-animated flick Rio -- are now free as the App Store's App of the Week promotion. They'