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
Merge pull request #2 from rg3/master

Update
[RTLnowIE] Add support for http://n-tvnow.de
[RTLnowIE] Allow video description without upload date

Some videos (feature films) have no upload date.
Fix help of --cachedir
[ign] Support more urls and detect multiple videos in articles (fixes #1543)
[france2] Add support for URLs without video IDs (Fixes #1547)
release 2013.10.04
[youtube] new static 82 signature
Merge remote-tracking branch 'rzhxeo/rtl_upload_date'
Merge remote-tracking branch 'rzhxeo/rtl_ntv'
Changes suggested by @phihag
Unused variable
Use self._download_webpage everywhere
[FlickrIE] Fix HTTPS url
Merge pull request #1551 from rzhxeo/flickr

[FlickrIE] Fix HTTPS url
[ted] Prepare #980 merge