[gameone] Add new extractor gameone

Currently only usable for downloading tv episodes residing under
http://www.gameone.de/tv/
[gameone] Added explanation for usage of http://cdn.riptide-mtvn.com/
[gameone] Added extraction of description and fixed failing tests
[gameone] Simplified extraction of description
[gameone] Added extraction of age_limit
[gameone] Added timestamp extraction
[tenplay] Add new extractor
[gameone] Fix indentation and removed unused constants
Added vimple.ru support
removed extra char in regexp
Verified with pep8 and pyflakes
[drtv] Add extractor for DR TV (Closes #3126)
[Motherless] Add new extractor
[ArteTVFuture] fix empty formats list
[drtv] Add missing extractor import
Merge pull request #3167 from Schnouki/motherless

* mother/motherless:
  [Motherless] Add new extractor
[Motherless] simplify
[vk] Update test
[Toypics] support https urls
[Tumblr] fix test + add description