Added:
	- AI! AIBar class now moves bar by itself with modifiable
	  settings for difficulty

Modified:
	- Algorithm to detect collision now checks the next frame and
	  current to see if the edge of the bar to collide with is in
between the two -- no more phasing. The top and bottom might need some
tuning, though
	- Ball is reset instead of a new one being created so that the
	  AI can keep track of it
	- No more two player option -- I may not even add it. Not sure
	  yet. Playing two player on one computer's pretty 1990s, isn't
it?