Add support for wetube.io

[sciunto]

Please follow the guide below

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.06.11.3. 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 Issues with outdated version will be rejected.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 2016.06.11.3

Before submitting an issue make sure you have:

• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

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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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

youtube-dl 'https://www.wetube.io/video/conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs/' -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['https://www.wetube.io/video/conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs/', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.06.11
[debug] Python version 3.5.1 - Linux-4.6.2-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg 3.0.2, ffprobe 3.0.2, rtmpdump 2.4
[debug] Proxy map: {}
[generic] conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs: Requesting header
WARNING: Falling back on generic information extractor.
[generic] conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs: Downloading webpage
[generic] conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs: Extracting information
ERROR: Unsupported URL: https://www.wetube.io/video/conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs/
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 676, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 342, in extract
    return self._real_extract(url)
  File "/usr/lib/python3.5/site-packages/youtube_dl/extractor/generic.py", line 2154, in _real_extract
    raise UnsupportedError(url)
youtube_dl.utils.UnsupportedError: Unsupported URL: https://www.wetube.io/video/conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs/

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):

• Single video: https://www.wetube.io/video/conference-de-pablo-servigne-effondrements-comment-encaisser-les-chocs/
• website : https://www.wetube.io