Log Message:
youtube-dl 2017.06.23

Core
[adobepass] Fix extraction on older python 2.6

Extractors
[youtube] Adapt to new automatic captions rendition
[hgtv.com:show] Relax video config regular expression
[drtuber] Fix formats extraction
[youporn] Fix upload date extraction
[youporn] Improve formats extraction
[youporn] Fix title extraction
[googledrive] Fix formats sorting
[watchindianporn] Fix extraction
[vimeo] Add fallback mp4 extension for original format
[ruv] Add support for ruv.is
[viu] Fix extraction on older python 2.6
[pandora.tv] Fix upload_date extraction
[asiancrush] Add support for asiancrush.com