真机测试，接入微信sdk后，调用授权登陆接口，获取返回的code。过一会游戏就crash了。
Assert failed: reference count should be greater than 0
Assertion failed: (_referenceCount > 0), function release, file /Users/summy/Documents/workspace/wlb/client/build/jsb-default/frameworks/cocos2d-x/cocos/base/CCRef.cpp, line 94.
