[vk] support for coub embeds

[kotofond]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.05.21.2. 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 Issues with outdated version will be rejected.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 2016.05.21.2

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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D:\>youtube-dl --verbose http://vk.com/video14117817_171304506
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', 'http://vk.com/video14117817_171304506']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2016.05.21.2
[debug] Python version 3.5.1 - Windows-10-10.0.10586-SP0
[debug] exe versions: ffmpeg N-78358-g674cc26, ffprobe N-78358-g674cc26, rtmpdump 2.4
[debug] Proxy map: {}
[vk] 14117817_171304506: Downloading webpage
[generic] fb-player: Requesting header
WARNING: Falling back on generic information extractor.
[generic] fb-player: Downloading webpage
WARNING: URL could be a direct video link, returning it as such.
[debug] Invoking downloader on 'http://c-cdn.coub.com/fb-player.swf?bot_type=vk&coubID=7w5a4'
[download] Destination: fb-player-fb-player.swf
[download] 100% of 197.08KiB in 00:00

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youtube-dl downloads swf file rather than the video