replace CC_SAFE_RELEASE  to  CC_SAFE_RELEASE_NULL.
Add SceneTest search paths.
Modify loadSceneEdtiorFileTest to LoadSceneEdtiorFileTest.
Merge branch 'master' into fixesBugs_Master
Merge pull request #4910 from chengstory/fixesBugs_Master

Fixes bugs on cocos2dx 2.x