[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
[adultswim] Add new extractor
[adultswim] Fix tests
[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
[comedycentral] Correct handling when latest tds episode is a special-episode instead of a regular one
[wistia] Add duration and modernize
[discovery] Change default url

URL does a redirect from dsc.discovery.com to www.discovery.com
This commit fixes the correct URL.
Merge pull request #3146 from pvdl/patch-1

[discovery] Change default url
[BlipTV] Allow plus sign in video ID
Merge pull request #3148 from crazedpsyc/master

[BlipTV] Allow plus sign in video ID
[rutube] Update playlist tests