Added more HLS demo assets.
Added more HLS demo assets.

Note that the captions on some of these assets do not display properly
at the moment, due to bugs on our part.

Issue #2035

Change-Id: I5cc8893b824af6ac27f8895565ed1dfbb970b039

tvoli/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player