issue #4118: refactor physics update
issue #4118: add PhysicsBody::setResting()
issue #4118:  fix bit mask bug
issue #4118:  add _isDamping to PhysicsBody and fix bugs
issue #4118: add physics contact test.
reset project.pbxproj
issue #4118:  rename set/getElasticity to set/getRestitution
issue #4118:  change PhysicsBody::updateDamping() to protected.
closed #4144: fix bug: Node::setPhysicsBody doesn't work at the second time.
fixed #3868. when singleton delted, it should dispatch callbacks.
Merge pull request #5460 from boyu0/iss4118_physical_performance_improve

issue #4118: Physical performance improve.
[AUTO] : updating submodule reference to latest autogenerated bindings
Update CHANGELOG [ci skip]
Merge pull request #5468 from CocosRobot/updategeneratedsubmodule_1393386076

[AUTO] : updating submodule reference to latest autogenerated bindings
Merge pull request #5467 from boyu0/bug4144_node_setphysicsbody

closed #4144: fix bug: Can not use Node::setPhysicsBody to reset a physics body.
Update CHANGELOG [ci skip]
[AUTO] : updating submodule reference to latest autogenerated bindings
Merge pull request #5470 from CocosRobot/updategeneratedsubmodule_1393386827

[AUTO] : updating submodule reference to latest autogenerated bindings
Merge pull request #5466 from andyque/bug3868

closed #3868. when singleton deleted, it should not dispatch callbacks. This PR resolves: Possible crash on repeat running between HttpClientTest, WebSocketTest, SocketIOTest.
Update CHANGELOG [ci skip]