Attributes' order in <li> is arbitrary and changes every time playlist
page is fetched, so we can't rely on `data-index` to be before
`data-video-username`.
We are at the point that testing takes waay too long for a release cycle, and fails way too often.
Tests through travis are a better indicator than testing just before release.
Extractor for videos from the Bayerischer Rundfunk Mediathek[1]. Currently only
supports videos. Audio and podcasts do not work yet with this extractor.
1: http://br.de/mediathek