Reference Player: Expose player to window

Created by: Ismael

It'd be nice if you would expose the player instance to window. That would allow us to test the API directly with the reference player.

   ////////////////////////////////////////
    //
    // Player Setup
    //
    ////////////////////////////////////////

    $scope.video = document.querySelector('.dash-video-player video');
    $scope.player = dashjs.MediaPlayer().create(); /* jshint ignore:line */
+  window.player = $scope.player;