IIIF 1.0 and 1.1 tests now depend on local tiles

Resolves #236. There are two sets of files, one for 1.0, which has sizes based on percent, and one for 1.1, which has sizes based on pixels (as it should have been all along). I'm only including the tiles the tests seem to request, to keep the size down. If you'd like the full set, let me know.