Project #2: Scene, creature, dog, birds, bomb. + keypress

SCENE: sky, sun, grass below (lower ~2/3 of screen) 
	- display title at the top and your name in lower-left corner
	- Display the score (upper left corner of sky).

CREATURE:  constant velocity DX, DY
	- bounce off "walls" (left, right, bottom, horizon)
	- reverse X direction, when mouse clicks on creature.
	- EXTRA:  Creature "shrinks" as he goes toward the horizon.  
		(Smaller when Y coordinate gets smaller.)

DOG:  follow the creature
	- chase at a rate that cuts the distance in half every second.
	- EXTRA:  dog's head should always point toward creature

BIRD:  flies thru the sky from left to right;
	- resume with new bird, whenever old bird exits right
	- Click near bird to start the bomb dropping.

BOMB:  bomb begins dropping, when 'b' key is pressed.

	- bomb continues falling (until bottom of screen)
	- if bomb hits creature, make a flash.  DEDUCT 50 points from score.
	- clicking on a bomb destroys it.

GOLD:  Create a gold nugger If click is on the grass but NOT near the creature (nor in the sky), 
	   . . . create a GOLD nugget:  3 concentric circles, shades of yellow/orange.
	- When creature gets within 10 pixels of gold, it vanishes (add 100 points!)
	(Note:  there is only one gold nugget at a time; it moves to where you click.)


KEY PRESS ACTIONS:  Pressing appropriate key does one of theses things:
	b	Starts bomb dropping from bird.
	2.  Clicking on the falling bomb makes it vanish (bombY = -1).
	3.  Clicking on the creature reverses his direction in X only.
	4.  Clicking elsewhere on grass creates GOLD nugget.
	5.  Clicking on the sky does nothing.

MOUSE CLICK ACTIONS:  As mentioned above, clicking does one of theses things:
	1.  Clicking near the bird starts the bomb dropping.
	2.  Clicking on the falling bomb makes it vanish (bombY = -1).
	3.  Clicking on the creature reverses his direction in X only.
	4.  Clicking elsewhere on grass creates GOLD nugget.
	5.  Clicking on the sky does nothing.

NOTE:  These descriptions are very approximate.
Feel free to vary the details and/or to add extras.

 Be sure to make everything "modular", to make changes easier.
 Each method MUST begin with a comment that says what you are trying to do! 


In project #2, score is displayed in upper-right corner.


Also:  different keys will cause other effects.