Handle new changes for Zing and Zing radio

For example http://mp3.zing.vn/xml/album-xml/kHxGtLGsdxEmiZLyZvxyFmLm. First node is 
"<duration>
<![CDATA[ ]]>
</duration>"
not item node. So we must ignore that.

And by the way, zing radio change url from mp3.zing.vn/radio to radio.zing.vn