Update cocos2dx/platform/ios/CCFileUtils.mm

fix the problem when calling CCFileUtils::sharedFileUtils()->getFileData("a.png") doesn't work.
Merge pull request #1862 from Horcruxes/master

getFileData("a.png") doesn't work on iOS.
Updated the submodule reference of cocos2d-js-tests.
Added Scale9Sprite js tests.
Merge pull request #1865 from dumganhar/master

Updated the submodule reference of cocos2d-js-tests.
fixed #1664:fixed a logical error in CCAtlasNode::setOpacityModifyRGB()
Merge pull request #1866 from minggo/iss1664-atlasnode

fixed #1664:fixed a logical error in CCAtlasNode::setOpacityModifyRGB()
Adding latest changes to CCFileUtils
Fixing bindings bug with getChildren
Adding ability to automatically search paths using older format of CocosBuilder