closed #3290: Updates cocos2d-x.
closed #3290: Adds 'ScriptingCore::isFunctionOverridedInJS' method. Implements setCalledFromScript/isCalledFromScript.
We need to check whether 'onEnter' method was override in JS and decide whether to invoke js_cocos2dx_Node_onEnter.
closed #3290: Implements Node.onEnter/onExit, They're not empty bindings now.
Merge pull request #90 from dumganhar/onenter-order

closed #3290: Patch for that onEnter's order is wrong