Log Message:
Update net/youtube-dl to 20160530

Changes:
2016.05.30
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[coub] add new extractor
[eyedottv] add new extractor
[radiocanada] add new extractor
[reuters] add new extractor
[*] various bug fixes and improvements

2016.05.21.2
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[*] check for python3 rsa module

2016.05.21.1
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[*] check for pandoc

2016.05.21
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[cbslocal] add a new extractor
[sendtonews] add a new extractor
[anvato] add a new extractor
[localnews8] add a new extractor
[learnr] add a new extractor
[formula1] add a new extractor
[abcnews] add a new extractor
[*] various bug fixes and improvements

2016.05.16
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[collegehumor] remove extractor
[3qsdn] add extractor
[cinemassacre] remove extractor
[sina] fix extraction
[openload] fix extraction
[ustudio] add support ustudio app/embed urls
[nrk] rework extractor
[*] various bug fixes and improvements

2016.05.10
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[socks] add support for SOCKS proxies
[ceskatele] add support for live streams
[mva] add new extractor
[litv] add new extractor
[fczenit] misc fixes
[udemy] modernize
[yandexmusic] modernize
[vevo] various improvements
[*] various bug fixes and improvements