[twitch] player.twitch.tv 'channel' parameter support

[hummitus]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.02.01. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.02.01

What is the purpose of your issue?

• 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)
• Question
• Other

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$ youtube-dl -vg https://player.twitch.tv/?channel=lotsofs
[debug] System config: []
[debug] User config: ['--no-mtime']
[debug] Custom config: []
[debug] Command-line args: ['-vg', 'https://player.twitch.tv/?channel=lotsofs']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.02.01
[debug] Python version 3.6.0 - Linux-4.9.6-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg 3.2.2, ffprobe 3.2.2, rtmpdump 2.4
[debug] Proxy map: {}
WARNING: Falling back on generic information extractor.
ERROR: Unsupported URL: https://player.twitch.tv/?channel=lotsofs
Traceback (most recent call last):
  File "/usr/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 694, in extract_info
    ie_result = ie.extract(url)
  File "/usr/bin/youtube-dl/youtube_dl/extractor/common.py", line 369, in extract
    return self._real_extract(url)
  File "/usr/bin/youtube-dl/youtube_dl/extractor/generic.py", line 2551, in _real_extract
    raise UnsupportedError(url)
youtube_dl.utils.UnsupportedError: Unsupported URL: https://player.twitch.tv/?channel=lotsofs

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Any at the moment live twitch.tv channel: player.twitch.tv/?channel=streamer-username

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Description of your issue, suggested solution and other information

Issue: 9a0f999 only added support for the VOD parameter player.twitch.tv/?video=vXYZ
Solution: implement functionality to support the 'channel' parameter

[hummitus]

Cheers 👍