Added additional metadata to be more like official iTunes files
* Disk number is set to season
* Content Ratings are pulled from TVDB and added to the file
As the short description field is limited to 255, many TVDB descriptions end up cut off in the middle of a word. This simply shortens the description to the last full sentence (by using the '.')
Remove what I assume is debug code?
Merge pull request #38 from outlyer/master

Cleanly truncate description to fit into iTunes 'desc' field