tilemap supports XML layer format
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
the latest develop code merged
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into tilemap_plain_xml_format_support
added _currentTileIndex member to TMXLayerInfo
removed extra _currentTileIndex
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.
Invoke methods of Flurry SDK on UI thread in plugin flurry.
some more cleanup
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop
New label stuff cleanup and re factoring
some more refactoring and cleaning up
refactoring
cleanup
more cleanup
more cleanup
clean up