Day 2 - Bee collisions

Put in some additional elements today:

* Bees! And animations on bees! They deal damage if you collide with them, and I put some animation on that as well.

* Changed the coins into bubbles. Having coins randomly float upward seemed a little weird. Bubbles is a little less weird.

* Put in the fall slider, but haven't connected it to the end of the level / falling yet. That's for tomorrow.

* Updated a lot of the sounds.

* Tuned the clouds a little.

So, a little progress. I think the end level / other levels will be tricky but I should be able to get it done before I have to turn it in.