[redtube] Extract categories and tags

[razor1907]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like that [x])
• Use Preview tab to see how your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.09.15. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2016.09.15

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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verbose output as follows:

$ youtube-dl -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://www.redtube.com/1622217']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2016.09.15
[debug] Python version 3.4.4 - Windows-10-10.0.10586
[debug] exe versions: none
[debug] Proxy map: {}

example URLs :

http://www.redtube.com/1622217

Description of your issue, suggested solution and other information

Metadata like "categories" and "tags" are not included when downloading videos from redtube.com
This is most likely to be solved if 'categories': list, or 'tags': list, will be added to current extractor command.

[d34d0n]

Yes, please add ability to extract categories and tags from RT.