Integrate webcam

[timmattison]

@chasmastin and someone else (sorry, I forgot who) came up with the concept that we would snap a picture of whomever filled the coffee last.

Open questions:

• Where does the picture go and what do we do with it?
• Do we do any processing on the image? For example, do face detection and throw away images with no obvious face in them to avoid showing pictures of people walking away.
• How does the person know their picture is being taken?

Anyone interested in making this feature cool please throw ideas in the comments!

[timmattison]

To go cheap we're going to try the Logitech C270 camera - http://www.logitech.com/en-us/product/hd-webcam-c270

We can find them for under $20 now and it should do all we need.