Check for extra data when type is unknown.

Check for certain info labels when type returned from getItem is unknown.
If unkown type is really an episode, then season, episode number, showtitle and title should be available.
If unkown type is really a movie, then title and year should be available.
Pass this data along in dispatch.
Should fix scrobbling for certain video plugins.
Merge pull request #65 from nate1280/unknown_type_check

Check for extra data when type is unknown.