[googlesearch] Move test to extractor
[generic] Fix rss under Python 2.x and move test to extractor
Merge branch 'master' of github.com:rg3/youtube-dl
release 2014.08.25.3
[eighttracks] modernize
[utils] Let request headers override standard headers

What was I thinking when writing this?
[sportdeutschland] add new extractor
[mixcloud] Use a HEAD request when checking if the url is valid
[empflix] Adapt to malformed config XML
[empflix] Extract thumbnail
[ign] Fix extraction of video in articles
[empflix] Revert to XML parser

Don't rely on the XML being broken (if they fix it, our code wouldn't work anymore).
Instead, use the transform function we already have :)

This partially reverts commit c7bee2a7254d31b7c478c0ac33bf23bdeba1c53c.