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.
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
closed #2522: Let Image::initWithImageData() support the packed data.
closed #2522: Fix some coding style.
closed #2522: Fix compile error.
issue #2522: fix some wrong indent.
Merge branch 'tilemap_plain_xml_format_support' of https://github.com/simpliplant/cocos2d-x into tilemap_plain_xml_format_support and add extra control to parse the tmx file for load the xml format tiles.
issue #2533:add ATITC compressed texture support

soft decode test in Win32, ios, Mac. device decode test in HTC G14
Adreno 220 GPU.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into Atitc_decode