Channel4: Fix correct selection of series and episode

Channel4 changed the way they display the on demand web page.  Now all series
are present and the og:image method of determining the series and episode now
always picks up the latest even if you're downloading an earlier version.

Fix this by taking the series and episode from the dc:relation tags in the
feed instead

Signed-off-by: James Bottomley <JBottomley@Parallels.com>
1 file changed