add menu to press 2 seconds
add hide mapLayer process
fix conflict
Merge pull request #29 from huangshiwu/ludum-dare

add hide mapLayer process
modify mapLayer member name
Merge pull request #30 from huangshiwu/ludum-dare

modify mapLayer member name
Check the position index when getting the block.
Merge branch 'ludum-dare' of github.com:minggo/cocos2d-x into ludum-dare