Issue IKTRE-90 by tuj: Added display none for not visible slides
Issue IKTRE-92 by tuj: Added refresh of of source for iframe template.
Issue IKTRE-92 by tuj: Iframe reloader nu kun på show
Added offline check
Issue IKTRE-87 by tuj: Removed Offline event listener when video ended or error
Issue IKTRE-87 by tuj: Attempt to fix issues with videos crashing after a connection drop.
Merge branch 'development'