box2d outdate in the last package ????

Hi guys …

i can see in the lasted version of cocos2d-x, the box2d lib is outdated.

b2World(const b2Vec2& gravity);

the last version of box2d is another constructor

b2World(const b2Vec2& gravity, bool doSleep);

any particular reason?

and another thing, all examples in wiki pages are outdated.

maybe i can help to update all.