[xminus] update tkn extraction regex
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.