Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Fix collider detection
1.Fix when first frame have no key frame, the armature don't display.
2.Fix color change bug
a potential bug in Layer.

https://github.com/cocos2d/cocos2d-x/issues/2948
Update CCLayer.cpp

change "_accelerometerEnabled = false"
to "setAccelerometerEnabled(false)"
in method init().
a potential bug in ScrollView

check _touches in setTouchEnabled
1.Fix color tween bug
1.Fix empty frame bug
2.Change Skin function interface name
update
Change Tween Type to Frame Index
remove CCShaderNode
Bone can add a particle display as a CCNode
Merge branch 'master' into develop
Change Physics detector
Remove vld.h
Merge branch 'master' into develop
1.Fix release CCTexture2DMutable.cpp crash
2.Change frame tween method
Fix for #2892.
1. Updatet the API documentation and parameter name from "object" to "sender" to reflect it's true purpose.
2. Fixed addObserver and observerExisted because it didn't allowed to add observers to notifications that only differs by sender
Fix for #2892.
3. Fixed registerScriptObserver method.