Fixes display of time in thumbnails, need to target...

...specific browsers with some additional CSS

	modified:   main/templates/exams/videotest.css
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Merge branch 'master' of https://github.com/Stanford-Online/class2go into wescott-master-exercise-work
Fix for #1892

Added download link with video.dl_link if video.dl_link exists;
CSS styles there too

	modified:   templates/content_groups/video_additional_content_style.html
	modified:   templates/exams/videotest.css
Merge pull request #1932 from Stanford-Online/wescott-master-exercise-work

Wescott master exercise work