Initial commit - working demo

Works with the new multilightbox library from
https://gitorious.org/multilightbox/multilightbox

Also has fullscreen and close. Very fun.

Change-Id: I6d61f6590843e1767bc7492dbd98e6aa3b85fcdc
Play with the information sent back from the hook

Send people to [[:mw:Multimedia/Media Viewer]] which is less technical
maybe, and also remove the screenshot for now - will re-enable when we
have one to put in.

Change-Id: I15b82bd24e611c26e8f412a7134780c632c0e688