Add support for Digg-hosted videos

[Leftium]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.01.07. 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 Issues with outdated version will be rejected.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 2018.01.07

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

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

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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 ```):

$ yy -v digg.com/video/sci-fi-short-jonah-daniel-kaluuya-get-out
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-k', '-v', 'digg.com/video/sci-fi-short-jonah-daniel-kaluuya-get-out']
[debug] Encodings: locale cp949, fs mbcs, out cp949, pref cp949
[debug] youtube-dl version 2018.01.07
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.16299
[debug] exe versions: ffmpeg N-87871-g7480f232d2, ffprobe N-87871-g7480f232d2
[debug] Proxy map: {}
WARNING: The url doesn't specify the protocol, trying with http
[generic] sci-fi-short-jonah-daniel-kaluuya-get-out: Requesting header
WARNING: Could not send HEAD request to http://digg.com/video/sci-fi-short-jonah-daniel-kaluuya-get-out: HTTP Error 405: Not Allowed
[generic] sci-fi-short-jonah-daniel-kaluuya-get-out: Downloading webpage
WARNING: Falling back on generic information extractor.
[generic] sci-fi-short-jonah-daniel-kaluuya-get-out: Extracting information
ERROR: Unsupported URL: http://digg.com/video/sci-fi-short-jonah-daniel-kaluuya-get-out
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp4k56gdgt\build\youtube_dl\YoutubeDL.py", line 784, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp4k56gdgt\build\youtube_dl\extractor\common.py", line 438, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp4k56gdgt\build\youtube_dl\extractor\generic.py", line 3086, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: http://digg.com/video/sci-fi-short-jonah-daniel-kaluuya-get-out

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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: http://digg.com/video/sci-fi-short-jonah-daniel-kaluuya-get-out

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Description of your issue, suggested solution and other information

• Digg.com used to just embed other services' videos, but recently a new Digg-branded player started appearing
• Sometimes the Digg player just wraps other services' videos (I think youtube-dl still works in this case)
• However, this particular video doesn't work. I think Digg is (re)hosting it themselves.
• As I was filling out this issue, I found the YouTube version of this video here: https://io9.gizmodo.com/get-out-star-daniel-kaluuya-becomes-obsessed-with-a-gia-1793066746

Thanks a lot!