Merge pull request #8922 from TimothyZhang/do-not-lock-when-no-message-in-websocket

avoid locking when message queue is empty in websocket
[AUTO][ci skip]: updating cocos2dx_files.json
[AUTO]: updating luabinding automatically
Merge pull request #9624 from CocosRobot/update_cocosfiles_1419487850

[AUTO][ci skip]: updating cocos2dx_files.json
[ci skip]Don't notify because we don't use travis now.
Merge pull request #9625 from CocosRobot/update_lua_bindings_1419487927

[AUTO]: updating luabinding automatically