SoundcloudSetIE: Use upload_date in the unified format (fixes #812)
Remove a commented line I forgot.

[ci skip]
--proxy option
release 2013.04.30
Fix help for --proxy
Fix FakeDownloaders
Correctly clear the line before writing a new status line
release 2013.04.31
Add test for SoundcloudSet
 Split FileDownloader in two classes: FileDownloader and YoutubeDL

YoutubeDL is the class that coordinates everything
FileDownloader gets a filename and an info dict and downloads the video.