[yandexmusic] Add support for artist's tracks

[telkel]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.01.29. 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 Issues with outdated version will be rejected.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 2017.01.29

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• 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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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

user@host $ youtube-dl -v https://music.yandex.ru/artist/617526/tracks
[debug] System config: []
[debug] User config: [u'--output', u'%(title)s.id=%(id)s.fmt=%(format)s.%(ext)s', u'--format', u'best[height<=?1080]', u'--rate-limit', u'1000K', u'--sleep-interval', u'2', u'--no-overwrites', u'--write-description']
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://music.yandex.ru/artist/617526/tracks']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.01.29
[debug] Python version 2.7.12 - Linux-4.4.0-59-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: avconv 2.8.10-0ubuntu0.16.04.1, avprobe 2.8.10-0ubuntu0.16.04.1, ffmpeg 2.8.10-0ubuntu0.16.04.1, ffprobe 2.8.10-0ubuntu0.16.04.1, rtmpdump 2.4
[debug] Proxy map: {}
[generic] tracks: Requesting header
WARNING: Falling back on generic information extractor.
[generic] tracks: Downloading webpage
[generic] tracks: Extracting information
ERROR: Unsupported URL: https://music.yandex.ru/artist/617526/tracks
Traceback (most recent call last):
  File "/home/people/dig/bin/youtube-dl/youtube_dl/extractor/generic.py", line 1711, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/home/people/dig/bin/youtube-dl/youtube_dl/compat.py", line 2526, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=_TreeBuilder(element_factory=_element_factory)))
  File "/home/people/dig/bin/youtube-dl/youtube_dl/compat.py", line 2515, 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: mismatched tag: line 32, column 6
Traceback (most recent call last):
  File "/home/people/dig/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 694, in extract_info
    ie_result = ie.extract(url)
  File "/home/people/dig/bin/youtube-dl/youtube_dl/extractor/common.py", line 369, in extract
    return self._real_extract(url)
  File "/home/people/dig/bin/youtube-dl/youtube_dl/extractor/generic.py", line 2551, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: https://music.yandex.ru/artist/617526/tracks

Starndard output of youtube-dl -v --dump-pages https://music.yandex.ru/artist/617526/tracks is in gist:5e880dc04f3101a2969e3bd9d14f48f4 .

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Description of your issue, suggested solution and other information

Apparently, I can't download tracks, but can successfully download one track:

user@host $ **youtube-dl -v https://music.yandex.ru/album/345642/track/3269099**
[debug] System config: []
[debug] User config: [u'--output', u'%(title)s.id=%(id)s.fmt=%(format)s.%(ext)s', u'--format', u'best[height<=?1080]', u'--rate-limit', u'1000K', u'--sleep-interval', u'2', u'--no-overwrites', u'--write-description']
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://music.yandex.ru/album/345642/track/3269099']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.01.29
[debug] Python version 2.7.12 - Linux-4.4.0-59-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: avconv 2.8.10-0ubuntu0.16.04.1, avprobe 2.8.10-0ubuntu0.16.04.1, ffmpeg 2.8.10-0ubuntu0.16.04.1, ffprobe 2.8.10-0ubuntu0.16.04.1, rtmpdump 2.4
[debug] Proxy map: {}
[yandexmusic:track] 3269099: Downloading track JSON
[yandexmusic:track] 3269099: Downloading track location JSON
WARNING: There's no description to write.
[debug] Invoking downloader on u'http://s09f.storage.yandex.net/get-mp3/1fd68d210b46303be7f307b4c391786d/000547583936ee95/music/11/2/data-0.7:13694250131:497161?track-id=3269099&from=service-10-track&similarities-experiment=default'
[download] Sleeping 2.0 seconds...
[download] Destination: Ringtone Hits - Who Let the Dogs Out.id=3269099.fmt=0 - unknown.mp3
[download] 100% of 485.51KiB in 00:00
user@host $