add

SpriteFrameCache::addSpriteFramesWithFileContent()
SpriteFrameCache::removeSpriteFramesFromFileContent()
add

SpriteFrameCache::addSpriteFramesWithFileContent()
SpriteFrameCache::removeSpriteFramesFromFileContent()
spaces
add test case
Merge pull request #7617 from rny/SpriteFrameCache

SpriteFrameCache load from plist file content data