Diaoul/subliminal — pull request #361 by h3llrais3r (2014-03-24 20:14:13+00:00)
Title: Make hearing_impaired option more flexible

Hearing impaired has now 3 values:
- True -> download only hearing_impaired subtitles
- False -> download no hearing_impaired subtitles
- None -> download all (do not check hearing_impaired value)

-> None becomes default value in download_best_subtitles

-> Fixes https://github.com/Diaoul/subliminal/issues/343