add linkify check to media object
add linkify check to media object

NUKnightLab/TimelineJS3,wangjun/TimelineJS3,wangjun/TimelineJS3,tkandala/TimelineJS3,tkandala/TimelineJS3,LauraHilliger/TimelineJS,wangjun/TimelineJS3,tkandala/TimelineJS3,LauraHilliger/TimelineJS,NUKnightLab/TimelineJS3,LauraHilliger/TimelineJS,NUKnightLab/TimelineJS3