Self slide.
Added stacker jpg.
Stacker slide stub.
Stacker slide inserted.
Added shykes's very excellent Stackoverflow docker answer (original http://stackoverflow.com/questions/17989306/what-does-docker-add-to-just-plain-lxc) for offline perusal.
Added SO for VM/Docker comparison (original http://stackoverflow.com/questions/16047306/how-is-docker-io-different-from-a-normal-virtual-machine)
Can't try it out, so I'm removing the try-it-out slide.
Added questions slide.