Merge pull request #41 from thnkloud9/master

IM-2191: overlapping of placeholder images and videos on certain screen ...
Slideshow overlay text now has a background of 80% opacity
Merge branch 'master' of github.com:newscoop/theme-StoryTeller
fix issue with bx-viewport size discrepency
Merge branch 'master' of github.com:thnkloud9/theme-StoryTeller