[Camsoda] Add new extractor

[JChris246]

Before submitting a pull request make sure you have:

• At least skimmed through adding new extractor tutorial and youtube-dl coding conventions sections
• Searched the bugtracker for similar pull requests
• Checked the code with flake8

In order to be accepted and merged into youtube-dl each piece of code must be in public domain or released under Unlicense. Check one of the following options:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

---

###Add new extractor camsoda to download live streams from the site

[dstftw]

Does not work:

> py -3.7 .\youtube_dl\__main__.py https://www.camsoda.com/tifanny01 -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.camsoda.com/tifanny01', '-v']
[debug] Encodings: locale cp1251, fs utf-8, out utf-8, pref cp1251
[debug] youtube-dl version 2019.08.02
[debug] Git HEAD: e950312
[debug] Python version 3.7.0 (CPython) - Windows-10-10.0.10240-SP0
[debug] exe versions: ffmpeg N-85653-gb4330a0, ffprobe N-85653-gb4330a0, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[Camsoda] Downloading user data: tifanny01
ERROR: Unable to download JSON metadata: <urlopen error [WinError 10054] An existing connection was forcibly closed by the remote host> (caused by URLError(ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None)))
  File "C:\Dev\youtube-dl\master\youtube_dl\extractor\common.py", line 627, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "C:\Dev\youtube-dl\master\youtube_dl\YoutubeDL.py", line 2229, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "C:\Python\Python37\lib\urllib\request.py", line 525, in open
    response = self._open(req, data)
  File "C:\Python\Python37\lib\urllib\request.py", line 543, in _open
    '_open', req)
  File "C:\Python\Python37\lib\urllib\request.py", line 503, in _call_chain
    result = func(*args)
  File "C:\Dev\youtube-dl\master\youtube_dl\utils.py", line 2724, in https_open
    req, **kwargs)
  File "C:\Python\Python37\lib\urllib\request.py", line 1319, in do_open
    raise URLError(err)

Also read coding conventions.

[JChris246]

Im actually not sure why you are getting the error with that version of python, it works fine with the others ... i dont have that version to test so i would need help figuring that out

[dstftw]

Inline.

[dstftw]

Breaks on non dict user.