add ZDFIE and _download_with_mplayer(mms://,rtsp://)
added HypemIE

rebased, closes PR #871
style and error handling edits to HypemIE
Added Vbox7 Infoextractor
Merge pull request #878 from yasoob/master
Added Vbox7.com InfoExtractor and tests.
Merge pull request #853 from mc2avr/master

add ZDFIE
Set the extractor key in playlists entries

If they were videos the extractor key wasn't being set anywhere else
Closes 877