add mini game right after levelclear screen.

dont know how to start a new full  level game yet.  so there will be an
error when answered the mini game question at second time.
Fixed some sound issues

Added the spaceship sound to the spaceship function so that it will
play ever mini game.
More Improvements in this branch
Merge branch 'Boyang-test1'

Conflicts:
	game/CaptainMath.py