Replace 404 url
Fix download error in GooglePlus
Merge pull request #3924 from Dineshs91/googleplus-fix

Fix download error in GooglePlus
[googleplus] Modernize and extract all formats
Merge pull request #3923 from Dineshs91/howstuffworks-fix

Replace 404 url
[vimeo] Make the protocol mandatory in the url (fixes #3926)

If it's missing, it will be correctly handled by the generic IE.
[mixcloud] Fix metadata extraction (fixes #3930)
[theonion] Add new extractor (closes #3928)
[theonion] Fix a small mistake in string formatting