documentation comments
Fixed a box2d update issue

Fixed an update issue that could cause un-smooth scrolling
Fixed issue when camera follows a node inside an asset.
Now you can setup your own Box2d simulation values
changed default box2d simulation values comments
Updated Box2d version + improved collision

Now objects can be removed inside collision handling callbacks.
joint removal inside collision callback
Improved collision handling and joints
Merge pull request #7 from vladubogdan/develop

Improved collision handling and joints