Added New Provider for DailyTvTorrents

I've added full support for the DailyTvTorrents.org RSS feeds.
- All the major RSS Feed parameters are supported and configurable (eg. quality preferences, minage, wait, norar, single)
- The Scheduled Search uses the default feed (combined feed of new episodes)
- Backlog searches work using the per-show feeds
- Includes the ability to override the show name used for the queries (on the show Add and Edit pages), since DailyTvTorrents doesn't currently support querying by tvdb_id