Update parser_guessit.py

changed 'name_only' to False in the assignment to guessit.default_options, this variable is set globally to guessit and using 'name_only' as True causes problems on subliminal,
preventing it from downloading subtitles for some providers (e.g. addic7ed)

more detailed info on
http://discuss.flexget.com/t/flexget-subliminal-guessit/622/12