Tooltip to show video progress
Changing the percentage to show no decimal points
fixes #1818 video glitches when clicking quiz thumbnail

Candy: adds time labels in each thumbnail.

The glitch is fixed by using a "flip-flop".  When a displayQuestion
event fires, the event disables itself from firing again.  A paired
event .5 second later re-enables the event.  This prevents the
"knife-edge" effect which was causing the repeated looping.
1s -> 0.5s
slightly taller slidestrip
small nitty fix
Merge pull request #1824 from Stanford-Online/wescott-master-exercise-work

Wescott master exercise work
Merge pull request #1829 from Stanford-Online/vidya-master-onHover

Show Video Progress text on hover
Merge pull request #1823 from Stanford-Online/jbau-video-glitch

Jbau video glitch
Fix for #1826

Add Show/Hide toggle link for showing/hiding the explanation, because
adding/changing buttons leads to a dark path

	modified:   templates/exams/view_exam.html
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work