Fix crash when subtitles are not found
More fixes on subtitles errors handling
don't catch YT user URLs in YoutubePlaylistIE (fix #754, fix #763)
import all IEs when testing to resemble more closely the real env
retry on UnavailableVideoError
Use report_error in subtitles error handling
Fix crash when subtitles are not found and the option --all-subs is given
Don't crash in FileDownloader if subtitles couldn't be found and errors are ignored
Merge pull request #764 from jaimeMF/subtitles_not_found

Fix crash when subtitles are not found
Restore youtube-dl (update) binary (#770)
release 2013.04.03