[youtube] Detect formats 298 et al as mp4 (Fixes #4066)
[FunnyOrDie] Add support for "/articles/" URLs
Merge pull request #4069 from anovicecodemonkey/support_funnyordie_articles_urls

[FunnyOrDie] Add support for "/articles/" URLs
[funnyordie] Add articles URL test
[canalplus] Tweak extractor to support piwiplus (Closes #4046)
[canalplus] Improve and merge with d8 extractor
[mlb] Improve _VALID_URL (Closes #4063)
[generic] Improve MLB iframe regex