[generic] Add support for single quotes in HTML5 videos (Fixes #4265)
[sztvhu] Modernize
[sztv] Remove useless determine_ext call
[folketinget] Add extractor (Fixes #4262)
[YoutubeDL] Fix multi_video check
release 2014.11.21.1
Remove binary and auto-updating entry point
Remove update functionality
Update UA
Wait ~1 sec between HTTP requests to avoid getting CAPTCHAed by Google
For YouTube videos we already have, skip without even requesting video info
When continuing a YouTube download with --continue, skip it if the directory has any download with the same ID, even if it has a different filename.
Copy the mtime from the oldest source file to the file created by ffmpeg

Fixes #4245
Use os.replace when available to avoid intermittent FileExistsError problems
Ugly YouTube-specific hack to avoid creating hidden files
Prefer mp4/m4a formats over webm
Prefer 1080p/60 over 2160p/30, this gets us format 299 instead of 266 for some YouTube videos