Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
1.add tweenFrame value
2.fix set loop type
Merge branch 'master' of https://github.com/2youyouo2/cocos2d-x
Merge pull request #3850 from dumganhar/master

[master] Removing unused variable, otherwise, it will trigger compilation error on linux.
Merge pull request #3848 from 2youyouo2/master

update armature
fixed isFileExist to use full path
updated readme with note to clone the repo and not download the zip version
Merge pull request #3858 from MSOpenTech/winrt-readme-fix

[ci skip]Winrt readme fix
Merge pull request #3851 from MSOpenTech/winrt-fileutils-fix

[ci skip]Winrt fileutils fix
optimize gui reader
Merge branch 'master' into master_nutty_modify_version
fix tween effect
fix reading CCSpriteFrame crash
optimize layout
remove useless codes
Modify "setLayoutParameter" method
Merge pull request #3927 from nutty898/master_nutty_optimizelayout

Master nutty optimizelayout
1.Add removeDisplay method
2.Add Armature Nesting Test 2
3.Remove unused code in CCDisplayFactory.cpp
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