This way, we don't have to do an aditional request
It seems that all the videos with age restriction use now the age gate method, which doesn't require any confirmation.
[bliptv] Fix some videos not downloading
See https://github.com/rg3/youtube-dl/issues/3544#issuecomment-53166516
In some videos (for example, http://blip.tv/play/gbk766dkj4Yn) resolving lookup id would fail, because page at http://blip.tv/play/gbk766dkj4Yn.x?p=1 would have no "config.id" in it. Fixed by requesting different URL and inspecting the URL which the client is redirected to.
From now on, the line from __future__ import unicode_literals should be contained in every single Python file lest we run into any more 2.x/3.x issues. Going forward, we're likely to develop on 3.x only and would likely miss subtle bugs otherwise.