remade stacks demo so it demonstrates all possible shape pairs
remade stacks demo so it demonstrates all possible shape pairs

schteppe/cannon.js,beni55/cannon.js,schteppe/cannon.js,jzitelli/cannon.js,Tezirg/cannon.js,Tezirg/cannon.js,mcanthony/cannon.js,DLar/cannon.js,jzitelli/cannon.js,DLar/cannon.js,mcanthony/cannon.js,beni55/cannon.js