Support for handling double episodes

I believe this could also be extended to support multi-episode files, instead of just double-episode.

Tested on 3 or 4 double episode files, and it seems to work.  It picks up on the fact that its a double episode, and once its passed 50% complete, it sends out a scrobble on the first episode, and starts sending the 2nd episodes data for watching info.

Needs some more testing of course, and feedback.