60: "Missing or invalid `size`."
Without at least a size, no IIIF can be displayed.
61: "Cannot determine IIIF Image API version from provided image
information JSON."
Without finding out the version information, one could only guess how to
use the image info JSON.
src/ol/source/IIIF.js contains a tile source for IIIF Image API services.
It supports Image API version 1 and 2 on compliance levels 0, 1 and 2.
To get working constructor options for IIIF from an IIIF image info.json,
use src/ol/format/IIIFInfo.js.
An example is available in examples/iiif.html respectivly examples/iiif.js.
