[Go90] Show playlist download support

[HeroCC]

• I've verified and I assure that I'm running youtube-dl 2017.06.12

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• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
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I'm trying to get some shows from Go90, and unfortunately when I give it a show list, it doesn't recognise it as a playlist. Ideally, when passing this link it would treat it as a playlist and start downloading the shows. Example:

• Playlist: https://www.go90.com/shows/fringe
• Playlist: https://www.go90.com/shows/6gcKLzhZLIi

Thanks all!