youtube-dl 2017.10.29

Core

• [extractor/common] Prefix format id for audio only HLS formats

• [utils] Add support for zero years and months in parse_duration

Extractors

• [egghead] Fix extraction (#14388)

• [fxnetworks] Extract series metadata (#14603)
• [younow] Add support for younow.com (#9255, #9432, #12436)

• [dctptv] Fix extraction (#14599)
• [youtube] Restrict embed regex (#14600)
• [vimeo] Restrict iframe embed regex (#14600)
• [soundgasm] Improve extraction (#14588)

• [myvideo] Remove extractor (#8557)

• [nbc] Add support for classic-tv videos (#14575)
• [vrtnu] Add support for cookies authentication and simplify (#11873)
• [canvas] Add support for vrt.be/vrtnu (#11873)

• [twitch:clips] Fix title extraction (#14566)

• [ndtv] Add support for sub-sites (#14534)

• [dramafever] Fix login error message extraction

• [nick] Add support for more nickelodeon sites (no, dk, se, ch, fr, es, pt,
  ro, hu) (#14553)