release 2013.09.20.1
[southparkstudios] Fix mgid extraction
[southparkstudios] add support for http://www.southparkstudios.com/full-episodes/* urls (closes #1469)
Abort if extractaudio is given without a variable extension (#1470)
Merge branch 'master' of github.com:rg3/youtube-dl
Warn if no locale is set (#1474)
[dailymotion] Raise ExtractorError if the dailymotion response reports an error
[dailymotion] Add an extractor for users (closes #1476)
[livestream] Fix events extraction (fixes #1467)
[youku] better error handling

blocked videos used to cause death by TypeError, now we report what the
server says