Plane game update

Implemented Calum's vertical movement with some odd effects that aren't
necessarily game breaking, but I have no idea how to fix right now
because your code simply wasn't set up right according to the tutorials
we've done, namely a lack of proper variable usage when it comes to
height/paddleh/paddley(which doesn't exist yet paddlex does)

Also your wonky hit detection is solved. Your global variable was
"enemypaney". It took two seconds looking at your variables. You're
getting sloppy.

Anyway, if I don't catch you tommorow, we've just about finished all the
important things in progress with Canvas and now need to focus on
completely re-doing the project in Kinectic.JS. Calum can work on
getting the game to say "Game over" at 500 points with the time taken
displayed if that's too hard. A/J can work on the menu that will simply
show a title and "Click to start".