Merge branch 'hotfix/url-validator'
setting "0" credits is now honored
making poster image the max thumbnail
fixing bug: image viewer visible on load in html5
fixing bug: html5 gallery thumbnails now open the correct video
fixing bug: html5 slideshow button always visibile when in slideshow mode,
even when no images are in the presentation
fixing ipad css media queries
Merge branch 'master' into develop