[galileo] Add support for galileo.tv

[condor0765]

Make sure you are using the latest version:

• I've verified and I assure that I'm running youtube-dl 2018.03.14

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

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

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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:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

$ youtube-dl -v https://www.galileo.tv/video/diese-emojis-werden-oft-missverstanden/
[debug] System config: []
[debug] User config: [u'-o', u'./%(title)s.%(ext)s', u'--max-downloads=5', u'--restrict-filenames']
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://www.galileo.tv/video/diese-emojis-werden-oft-missverstanden/']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.03.14
[debug] Python version 2.7.12 (CPython) - Linux-4.4.0-98-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg N-87177-g69e6877de8-static, ffprobe N-87177-g69e6877de8-static, rtmpdump 2.4
[debug] Proxy map: {}
[generic] diese-emojis-werden-oft-missverstanden: Requesting header
WARNING: Falling back on generic information extractor.
[generic] diese-emojis-werden-oft-missverstanden: Downloading webpage
[generic] diese-emojis-werden-oft-missverstanden: Extracting information
ERROR: Unsupported URL: https://www.galileo.tv/video/diese-emojis-werden-oft-missverstanden/
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 2222, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 2542, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=_TreeBuilder(element_factory=_element_factory)))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 2531, in _XML
    parser.feed(text)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1653, in feed
    self._raiseerror(v)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1517, in _raiseerror
    raise err
ParseError: syntax error: line 1, column 2
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 785, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 440, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3151, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: https://www.galileo.tv/video/diese-emojis-werden-oft-missverstanden/

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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):

• Single video: https://www.galileo.tv/video/diese-emojis-werden-oft-missverstanden/

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Description of your issue, suggested solution and other information

Thanks!