Add iframe options to remove unnecessary spacing and allow fullscreen view.
Change asset/iframe URLs to use the current protocol.
Merge pull request #181 from sul-dlss/iframe-options

Add iframe options to remove unnecessary spacing and allow fullscreen
Merge pull request #182 from sul-dlss/https

Change asset/iframe URLs to use the current protocol.
Change number of items to number of images for image viewer.
Merge pull request #185 from sul-dlss/image-items

Change number of items to number of images for image viewer.
Add lazy loading to all views
Merge pull request #187 from sul-dlss/images-lazy-loading

Add lazy loading to all views
Add prev/next image navigation to the list view.