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
Changes suggested by @phihag
Unused variable
Use self._download_webpage everywhere
Add CinemassacreIE
[CinemassacreIE] Add support for other embed methods
[CinemassacreIE] Remove docstring from class
[CinemassacreIE] Use MD5 to check in TEST description
Only download 1 sec. with rtmpdump in test mode
Remove test parameter from _download_with_rtmpdump
[vevo] Some improvements (fixes #1580)

Extract the info from http://videoplayer.vevo.com/VideoService/AuthenticateVideo?isrc={id}
Some videos don't have an smil manifest, extract the video urls directly from the json and use the last version of the video.
Extract all the available formats and set the 'formats' field of the result
Tiny tpo
[youtube] set the 'name' parameter in the subtitles url (fixes #1577)
Merge pull request #1584 from wingsuit/master

Tiny tpo
[youtube] Do not recognize attribution link as user (Fixes #1573)
release 2013.10.09
Add an extractor for video.nhl.com (closes #1586)