closed #3714, Remove configurations which are not necessary in AndroidManifest.xml of aneroid projects.
closed #3723, Make sure the init method of Cocos2dxHelper only invoked once.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into android_bugs
Update CHANGELOG [ci skip]
Merge pull request #5083 from natural-law/android_bugs

Solve some bugs on android