Log Message:
Update net/youtube-dl to 20170501

Changes:
version 2017.05.01

Core
+ [extractor/common] Extract view count from JSON-LD
* [utils] Improve unified_timestamp
+ [utils] Add video/mp2t to mimetype2ext
* [downloader/external] Properly handle live stream downloading cancellation
  (#8932)
+ [utils] Add support for unicode whitespace in clean_html on python 2 (#12906)

Extractors
* [infoq] Make audio format extraction non fatal (#12938)
* [brightcove] Allow whitespace around attribute names in embedded code
+ [zaq1] Add support for zaq1.pl (#12693)
+ [xvideos] Extract duration (#12828)
* [vevo] Fix extraction (#12879)
+ [noovo] Add support for noovo.ca (#12792)
+ [washingtonpost] Add support for embeds (#12699)
* [yandexmusic:playlist] Fix extraction for python 3 (#12888)
* [anvato] Improve extraction (#12913)
    * Promote to regular shortcut based extractor
    * Add mcp to access key mapping table
    * Add support for embeds extraction
    * Add support for anvato embeds in generic extractor
* [xtube] Fix extraction for older FLV videos (#12734)
* [tvplayer] Fix extraction (#12908)

version 2017.04.28

Core
+ [adobepass] Use geo verification headers for all requests
- [downloader/fragment] Remove assert for resume_len when no fragments
  downloaded
+ [extractor/common] Add manifest_url for explicit group rendition formats
* [extractor/common] Fix manifest_url for m3u8 formats
- [extractor/common] Don't list master m3u8 playlists in format list (#12832)

Extractor
* [aenetworks] Fix extraction for shows with single season
+ [go] Add support for Disney, DisneyJunior and DisneyXD show pages
* [youtube] Recognize new locale-based player URLs (#12885)
+ [streamable] Add support for new embedded URL schema (#12844)
* [arte:+7] Relax URL regular expression (#12837)