[ard] Fix format extraction (fixes #3006 and #3032)
release 2014.06.04
[yahoo] Make thumbnail optional (Closes #3043)
[yahoo] Improve content id extraction
[yahoo] improve thumbnail extraction
Merge pull request #3047 from pulpe/yahoo_thumb

[yahoo] improve thumbnail extraction
[youtube:playlist] Fix mixes extraction (fixes #3051)

The username seems to be empty now.
[naver] Add rtmp formats (fixes #3054)
[naver] Modernize
[xvideos] Capture and output inline error if any
[xvideos] Replace test
[teachingchannel] Add extractor (closes #3048)