Figured out how to spawn a mine and end the game

if the cursor is over the mine. We now have to
not end the game until the user SELECTS the space
the mine is at. I hadn't realized that is_empty
only works if display is True? So I moved the
game.end() to the mine class.

minesweeper_game.py

@@ -4,9 +4,11 @@
 # This class implements a simple minesweeper game on a 9x9 gird.
 from retro.game import Game
 from cursor import Cursor
+from mine_spawner import MineSpawner 
 
 board_size = (9, 9)
 cursor = Cursor(board_size)
+spawner = MineSpawner(board_size)
 # spawner = AsteroidSpawner(board_size)
-game = Game([cursor], {"score": 0}, board_size=board_size)
+game = Game([cursor,spawner], {"score": 0}, board_size=board_size,debug=True)
 game.play()