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
Fixed broken links and wrong encoding in the doc.

Fixed Obj-C names when referening functions.
Changed some GB2312 encoded characters to UTF-8.
Changed two 'XXX class for cocos2d for iphone'.
Documentation & Cocos2d-x C++ Style
Merge pull request #3404 from timothyqiu/docfix

Documentation fix: broken links and wrong encoding in the doc...
Let CCDirector set all GL state
Merge pull request #2950 from zcgit/develop

a potential bug in Layer.
Update AUTHORS
Merge pull request #3439 from folecr/android_rendering_bugfix

Let CCDirector set all GL state in the Android port