Fix "unsupported feature" test
Fix "unsupported feature" test

Can't test unsupported features easily with an ever-increasing list of
supported features, so this hacks the IIIF handler to only support
level 1 features.

uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server