add auto bounce
refine bug bounce
refine bug bounce 1
add bugmanager
tiny revise for new openglbugmanager
tiny revise for new openglbugmanager 1
add modemanager, refine the bug's animation
add modemanager
tried to let bug get out of screen if possible
make bug be able to get out of screen
make bug be able to get out of screen from four direction