Adds support for passing a referer.
Updated README
Dont delete source file when source file and post-processed file are the same
Merge pull request #801 from expleo/add_referer_support
YoutubePlaylistIE: don't crash with empty lists (related #808)

The playlist_title wasn't initialized.
SteamIE: accept urls with agecheck
Allow to select videos to download by their upload dates (related #137)

Only absolute dates.
Fix some IEs that didn't return the uploade_date in the YYYYMMDD format

Create a function unified_strdate in utils.py to fix these problems
Rename soundcloud to soundcloud:set
Merge branch 'master' of github.com:rg3/youtube-dl
Re-enable Dailymotion (tests pass)
Allow to use relative dates in the format (now|today)[+-][0-9](day|week|month|year)(s)? (Closes #137)

Also fix DateRange not accepting ranges of one day.
Document the video selection using the upload date
Automatically set HTTPS proxy if given (Fixes #805)
Adapt tests to changes in youtube's "Most Popular" channel
release 2013.04.27
Fix print_notes
Default to --title (Fixes #499)
release 2013.04.28
Use report_warning when a not working IE will be uses