New code: show_cheats()

You'll also notice that a stand alone function called show_cheats has been added. Hunt the Wumpus is very difficult to debug efficiently unless you know where the hazards are so you can go straight to them and see if your program handles them properly. show_cheats has been included to give you that information. It tells you where the wumpus, bats and pits are so you can head toward or away from them during testing.

def show_cheats():
    '''Shows information about the cave system to ease debugging.
    Should be disabled in the final version.'''
    print 'Psst!'
    for room in cave_system.rooms:
        if room.has_bat(): print '   There\'s a bat in room', room.number
        if room.has_pit(): print '   There\'s a pit in room', room.number
        if room.has_wumpus(): print '   There\'s a wumpus in room', room.number