Provide compatibility  check_output for 2.6 (Fixes #2926)
Merge remote-tracking branch 'origin/master'
release 2014.05.16
[youtube] Look for published-on date if uploaded-on is not found

Fixes #2911
[generic] Fix redirect
[ffmpeg] Correct argument encoding on Windows with Python 2.x

Fixes #2924
[francetv] Add support for non-numeric video IDs (Fixes #2927)
Merge remote-tracking branch 'origin/master'
release 2014.05.16.1
[youtube] Fix extraction of the feed 'paging' values (fixes #2925)
Merge remote-tracking branch 'upstream/master'