akubra resolver

add to riiif.initializer.rb:

Riiif::Image.file_resolver = Riiif::AkubraSystemFileResolver

Riiif::AkubraSystemFileResolver.pathroot = <fedora /data datastream path>
Riiif::AkubraSystemFileResolver.imagetype = "jp2"
Riiif::AkubraSystemFileResolver.akubraconfig = [[0,2],[2,2],[4,1]]

[[0,2],[2,2],[4,1]] = ##/##/#