feat(src/*): use nodejs styled callback

From https://github.com/wearefractal/vinyl-fs/pull/26#discussion-diff-13787680
Not really think it's a good idea to look into codes, but since there's no documentation on the callback argument of _transform function, it shows that we can definitely pass the chunk in 
https://github.com/isaacs/readable-stream/blob/master/lib/_stream_transform.js#L184