-add-to now works
-play-to WOULD work if I could figure out how to get jQuery to deal with overlapping drop targets. I may need to just move to HTML5 for that.
-Re-wrote define-ajax; the front-end handlers are now defined and named consistently with the back-end ones
-You can now pick up cards by dragging them into your hand
-Properly working play-to, pick-up and add-to