fix bug: kankan extractor not support http://vod.kankan.com/v/70/70309.shtml
add an extractor for tv.sohu.com
use ..utils/clean_html()
fix parse title bug
improve sohu extractor
Merge remote-tracking branch 'Huarong/master'
[sohu] Handle encoding, and fix tests
Merge remote-tracking branch 'origin/master'