Add support for putlockers.ch

[gnurt1]

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• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.02.07. 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 Issues with outdated version will be rejected.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 2017.02.07

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• Searched the bugtracker for similar issues including closed ones

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• Bug report (encountered problems with youtube-dl)
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Putlockers.ch has films that don't have copyrights. That i want to download:
https://en.wikipedia.org/wiki/List_of_films_in_the_public_domain_in_the_United_States
THE AMAZING MR. X (1948) http://putlockers.ch/watch-the-amazing-mr-x-online-free-putlocker.html
A FAREWELL TO ARMS (1957) http://putlockers.ch/watch-a-farewell-to-arms-1957-online-free-putlocker.html
THE DEVIL (1940) http://putlockers.ch/watch-the-devil-bat-online-free-putlocker.html
BLOOD ON THE SUN (1945) http://putlockers.ch/watch-blood-on-the-sun-online-free-putlocker.html
THE GENERAL (1926) http://putlockers.ch/watch-the-general-1926-online-free-putlocker.html

(There are many more) So can you please add support for the website.

[dstftw]

youtube-dl does not support sites dedicated to copyright infringement.