This weekend Google announced that it was shutting down Picnik, its handy dandy free photo editing software. I've used it on a number of occasions for fast, easy jobs that didn't require anything more than simple resizing. But let's be honest: How many of those types of quick photo editing jobs are just for Facebook photos? Aviary, a photo editor for Web and mobile apps, saw this opportunity and jumped on it, launching a photo editor app today for Facebook....