youtube-dl 2017.12.31

Core

• [extractor/common] Add container meta field for formats extracted
  in _parse_mpd_formats (#13616)
• [downloader/hls] Use HTTP headers for key request

• [common] Use AACL as the default fourcc when AudioTag is 255
• [extractor/common] Fix extraction of DASH formats with the same
  representation id (#15111)

Extractors

• [slutload] Add support for mobile URLs (#14806)

• [abc:iview] Bypass geo restriction
• [abc:iview] Fix extraction (#14711, #14782, #14838, #14917, #14963, #14985,
  #15035, #15057, #15061, #15071, #15095, #15106)
• [openload] Fix extraction (#15118)

• [sandia] Remove extractor
• [collegerama] Remove extractor

• [mediasite] Add support for sites based on Mediasite Video Platform (#5428,
  #11185, #14343)
• [ufctv] Add support for ufc.tv (#14520)

• [pluralsight] Fix missing first line of subtitles (#11118)
• [openload] Fallback on f-page extraction (#14665, #14879)
• [vimeo] Improve password protected videos extraction (#15114)
• [aws] Fix canonical/signed headers generation on python 2 (#15102)