calculate offset correctly for tags and starred listing (fix #530)
calculate offset correctly for tags and starred listing (fix #530)

Hubcapp/commafeed,zhangzuoqiang/commafeed,RavenB/commafeed,syshk/commafeed,zhangzuoqiang/commafeed,RavenB/commafeed,Athou/commafeed,syshk/commafeed,zhangzuoqiang/commafeed,wesley1001/commafeed,zhangzuoqiang/commafeed,ahmadassaf/CommaFeed-RSS-Reader,syshk/commafeed,ebraminio/commafeed,wesley1001/commafeed,Hubcapp/commafeed,ahmadassaf/CommaFeed-RSS-Reader,ahmadassaf/CommaFeed-RSS-Reader,RavenB/commafeed,Athou/commafeed,Athou/commafeed,ebraminio/commafeed,syshk/commafeed,wesley1001/commafeed,RavenB/commafeed,Athou/commafeed,ebraminio/commafeed,Hubcapp/commafeed,Hubcapp/commafeed,wesley1001/commafeed,ebraminio/commafeed,ahmadassaf/CommaFeed-RSS-Reader