AlchemyVision API: Automatically extract and tag images

This works pretty well. Tagasauris has been around for a while and do something similar (but a bit more).

Great work though. I threw a bunch of my photos and it did a good job tagging with people, bike, beach, etc.

I've been wanting to integrate an automatic tagging system into Trovebox. That's how I know the Tagasauris team. One day....