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
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.
Adding tools/tolua .
Updating bindings-generator, adding lua target. It's not finished.
We has to pass the target to bindings-generator since we have add lua target.
Adding tools/tolua .
issue #2433:lua binding generator
Merge branch 'iss2433-lua-bindings-generator' of git://github.com/dumganhar/cocos2d-x into iss2433-lua-bindings-generator
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'.
issue #2433:lua binding generator add hello.lua
Documentation & Cocos2d-x C++ Style
issue #2433:Modify lua binding generator template and releated action test
issue #2433:Modify Testlua sample and add some manual binding functions
issue #2433:Modify cocos2d.ini
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into iss2433-lua-bindings-generator

Conflicts:
	cocos2d_libs.xcodeproj/project.pbxproj
	tools/bindings-generator
issue #2433:Update submodule and project