VimeoIE: allow to download password protected videos
README: Add brief description for manpages/apropos.

Trying to mimic the manpage of (GNU) `ls`, we don't conjugate the verb as
"downloads" or something else.

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
added StatigrIE
added StatigrIE
added test for Statigr
Merge pull request #905 from rbrito/manpage-apropos

README: Add brief description for manpages/apropos.
Merge remote-tracking branch 'yasoob/master'
Improve Statigr.am IE
Improvge error reporting
Merge remote-tracking branch 'origin/vimeo_passworded_videos'
[Statigr.am] Correct uploader id
Merge remote-tracking branch 'jaimeMF/vevo_fix'
Use new signature calculation method only if sig is not present
Improve vevo message
Fix generic class move (add all files)
Move youtube extractors to youtube_dl.extractor.youtube
[youtube] remove dead code
Move Metacafe and Statigram into their own files, and remove absolute import
Move DailyMotion into its own file
Move Photobucket into its own file