Clarify that download rate is in bytes per second

I found https://github.com/rg3/youtube-dl/commit/f918ec7ea29a37521d1fc22fb9f900283c5a2c49 but it is still not clear to anyone who hasn't read Issue #723 whether the limit is in bits or bytes.  This is doubly confusing because 1) ISPs usually advertise speeds in bits per second, and 2) lowercase "k" and "m" are often used in correlation with bits rather than bytes.
Extractor for websurg.com
Merge remote-tracking branch 'upstream/master' into websurg
Improvements
[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)
Restore accidentally deleted commits

That's what happens if you let Windows machines write :(
Implement more opcodes
Change test target (Verified with node.js)
Prepare signature function caching
Use reader instead of indexing
Clarify a couple of calls
[youku] better error handling

blocked videos used to cause death by TypeError, now we report what the
server says
[youtube] Add filesystem signature cache