Fix silly crash.
Enable cookies on video player, fixes #242.

Well that was easy. Apparently there is a way to make the video player to
respect Set-Cookie headers. Nobody in the Roku dev forum seems to know that,
I sort of stumbled upon it while getting ready to do it the hard way.
Silence another noisy HLS log.

Roku keeps adding undocumented HLS events to the video player. It's possible
that there's something in it that would be interesting to log, but for now
we'll just silence it.
Log information about downloaded HLS segments.