Log Message:
youtube-dl: Update net/youtube-dl to 20180127

Changes:
version 2018.01.27

Core
* [extractor/common] Improve _json_ld for articles
* Switch codebase to use compat_b64decode
+ [compat] Add compat_b64decode

Extractors
+ [seznamzpravy] Add support for seznam.cz and seznamzpravy.cz (#14102, #14616)
* [dplay] Bypass geo restriction
+ [dplay] Add support for disco-api videos (#15396)
* [youtube] Extract precise error messages (#15284)
* [teachertube] Capture and output error message
* [teachertube] Fix and relax thumbnail extraction (#15403)
+ [prosiebensat1] Add another clip id regular expression (#15378)
* [tbs] Update tokenizer url (#15395)
* [mixcloud] Use compat_b64decode (#15394)
- [thesixtyone] Remove extractor (#15341)

version 2018.01.21

Core
* [extractor/common] Improve jwplayer DASH formats extraction (#9242, #15187)
* [utils] Improve scientific notation handling in js_to_json (#14789)

Extractors
+ [southparkdk] Add support for southparkstudios.nu
+ [southpark] Add support for collections (#14803)
* [franceinter] Fix upload date extraction (#14996)
+ [rtvs] Add support for rtvs.sk (#9242, #15187)
* [restudy] Fix extraction and extend URL regular expression (#15347)
* [youtube:live] Improve live detection (#15365)
+ [springboardplatform] Add support for springboardplatform.com
* [prosiebensat1] Add another clip id regular expression (#15290)
- [ringtv] Remove extractor (#15345)

version 2018.01.18

Extractors
* [soundcloud] Update client id (#15306)
- [kamcord] Remove extractor (#15322)
+ [spiegel] Add support for nexx videos (#15285)
* [twitch] Fix authentication and error capture (#14090, #15264)
* [vk] Detect more errors due to copyright complaints (#15259)