Examples: better first folio title
Allow URL templates to be functions

This offers the most control for embedding by allowing you to pass a
function which returns a URL formatted however your image server
requires
Disable OpenSeadragon if dziUrlTemplate is not defined

This allows using the viewer for sites which have only images, not
DZI tile stacks
Examples: add Ptolemy

This example uses a scan from the Rare Book and Special Collections Division which is currently only available as static JPEG images
without deep zoom tiles.