Final fixes.

Couple things:

There was a logic error that caused a periodic uncaught exception to be thrown that I fixed.

When a current is deleted and a bubble is in it now, it just goes back to moving upward from wherever it was.

The game now also checks to see if bubbles that reach the top are in the right "HELP" quadrant. Check the "Update Bubbles" method for a spot. I should have marked where a player should be rewarded with a TODO comment.

Peace out gangsters. swerve.