Fluid 4853 - Show start and total times for youTube videos.

The play of youTube videos uses flash that's wrapped in by Media Element. The flash does not return the video duration value at the video initial load. But does return it when the video is at play.

Joanna suggests to hide the scrubber handle where the start & total times are displayed when the total time is unavailable and show the handle back once the total time value is received.

This branch also fixes some but not all test failures with Chrome and IE that are inherited from the master branch.