Log Message:
Update net/youtube-dl to 20170426

Changes:
version 2017.04.26

Core
* Introduce --keep-fragments for keeping fragments of fragmented download
  on disk after download is finished
* [YoutubeDL] Fix output template for missing timestamp (#12796)
* [socks] Handle cases where credentials are required but missing
* [extractor/common] Improve HLS extraction (#12211)
    - Extract m3u8 parsing to separate method
    - Improve rendition groups extraction
    - Build stream name according stream GROUP-ID
    - Ignore reference to AUDIO group without URI when stream has no CODECS
    - Use float for scaled tbr in _parse_m3u8_formats
* [utils] Add support for TTML styles in dfxp2srt
* [downloader/hls] No need to download keys for fragments that have been
  already downloaded
* [downloader/fragment] Improve fragment downloading
    - Resume immediately
    - Don't concatenate fragments and decrypt them on every resume
    - Optimize disk storage usage, don't store intermediate fragments on disk
    - Store bookkeeping download state file
+ [extractor/common] Add support for multiple getters in try_get
+ [extractor/common] Add support for video of WebPage context in _json_ld
  (#12778)
+ [extractor/common] Relax JWPlayer regular expression and remove
  duplicate URLs (#12768)

Extractors
* [iqiyi] Fix extraction of Yule videos
* [vidio] Improve extraction and sort formats
+ [brightcove] Match only video elements with data-video-id attribute
* [iqiyi] Fix playlist detection (#12504)
- [azubu] Remove extractor (#12813)
* [porn91] Fix extraction (#12814)
* [vidzi] Fix extraction (#12793)
+ [amp] Extract error message (#12795)
+ [xfileshare] Add support for gorillavid.com and daclips.com (#12776)
* [instagram] Fix extraction (#12777)
+ [generic] Support Brightcove videos in <iframe> (#12482)
+ [brightcove] Support URLs with bcpid instead of playerID (#12482)
* [brightcove] Fix _extract_url (#12782)
+ [odnoklassniki] Extract HLS formats

version 2017.04.17

Extractors
* [limelight] Improve extraction LimelightEmbeddedPlayerFlash media embeds and
  add support for channel and channelList embeds
* [generic] Extract multiple Limelight embeds (#12761)
+ [itv] Extract series metadata
* [itv] Fix RTMP formats downloading (#12759)
* [itv] Use native HLS downloader by default
+ [go90] Extract subtitles (#12752)
+ [go90] Extract series metadata (#12752)

version 2017.04.16

Core
* [YoutubeDL] Apply expand_path after output template substitution
+ [YoutubeDL] Propagate overridden meta fields to extraction results of type
  url (#11163)

Extractors
+ [generic] Extract RSS entries as url_transparent (#11163)
+ [streamango] Add support for streamango.com (#12643)
+ [wsj:article] Add support for articles (#12558)
* [brightcove] Relax video tag embeds extraction and validate ambiguous embeds'
  URLs (#9163, #12005, #12178, #12480)
+ [udemy] Add support for react rendition (#12744)

version 2017.04.15

Extractors
* [youku] Fix fileid extraction (#12741, #12743)

version 2017.04.14

Core
+ [downloader/hls] Add basic support for EXT-X-BYTERANGE tag (#10955)
+ [adobepass] Improve Comcast and Verison login code (#10803)
+ [adobepass] Add support for Verizon (#10803)

Extractors
+ [aenetworks] Add support for specials (#12723)
+ [hbo] Extract HLS formats
+ [go90] Add support for go90.com (#10127)
+ [tv2hu] Add support for tv2.hu (#10509)
+ [generic] Exclude URLs with xml ext from valid video URLs (#10768, #11654)
* [youtube] Improve HLS formats extraction
* [afreecatv] Fix extraction for videos with different key layout (#12718)
- [youtube] Remove explicit preference for audio-only and video-only formats in
  order not to break sorting when new formats appear
* [canalplus] Bypass geo restriction

version 2017.04.11

Extractors
* [afreecatv] Fix extraction (#12706)
+ [generic] Add support for <object> YouTube embeds (#12637)
* [bbccouk] Treat bitrate as audio+video bitrate in media selector
+ [bbccouk] Skip unrecognized formats in media selector (#12701)
+ [bbccouk] Add support for https protocol in media selector (#12701)
* [curiositystream] Fix extraction (#12638)
* [adn] Update subtitle decryption key
* [chaturbate] Fix extraction (#12665, #12688, #12690)