Per the latest from TVDB, we should not use the `www` subdomain.
  > http://forums.thetvdb.com/viewtopic.php?f=4&t=12909&start=70#p50065
Merge pull request #630 from thezoggy/dev--tvdb_drop_www

Per the latest from TVDB, we should not use the `www` subdomain.
Merge remote-tracking branch 'ms/development' into failed-download-handling