issue #3401: fix physics lua binding.
issue #3401: add lua contact test
issue #3401: add lua physics position/rotation test
Merge pull request #23 from boyu0/iss3401_physics_binding

issue #3401: physics binding
[AUTO] : updating luabinding automatically
Merge pull request #24 from CocosRobot/update_lua_bindings_1393828317

[AUTO] : updating luabinding automatically
fix:Add `reload` function to support reload module file
Merge branch 'master' of https://github.com/cocos2d/cocos2d-lua into tip_generator