[NSFW][chestymoms.com] Add support for chestymoms.com

[rushcore]

• I've verified and I assure that I'm running youtube-dl 2017.08.27.1

• At least skimmed through the README, most notably the FAQ and BUGS sections

• Searched the bugtracker for similar issues including closed ones

• Site support request (request for adding support for a new site)

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youtube-dl -v https://www.chestymoms.com/cam/GoddessKale/
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://chestymoms.com/cam/GoddessKale']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2017.08.27.1
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-71883-geb9fb50, ffprobe N-71883-geb9fb50, rtmpdump 2.4
[debug] Proxy map: {'http': 'http://127.0.0.1:6050', 'https': 'https://127.0.0.1
:6050', 'socks': 'socks://127.0.0.1:5060'}
[generic] GoddessKale: Requesting header
WARNING: Falling back on generic information extractor.
[generic] GoddessKale: Downloading webpage
[generic] GoddessKale: Extracting information
ERROR: Unsupported URL: https://chestymoms.com/cam/GoddessKale
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp_2hklmx2\bu
ild\youtube_dl\YoutubeDL.py", line 776, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp_2hklmx2\bu
ild\youtube_dl\extractor\common.py", line 434, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp_2hklmx2\bu
ild\youtube_dl\extractor\generic.py", line 2989, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://chestymoms.com/cam/GoddessKale

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Live stream example:

• Live stream: https://chestymoms.com/cam/GoddessKale/

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More infos:
chestymoms.com is a live stream site similar to chaturbate.com (which is supported by youtube-dl)