fixes #163
Merge pull request #200 from geoblacklight/more-details-link

Add "More details at" link for those layers with a url pointer
changes some of the show page metadata
Merge pull request #203 from geoblacklight/home-metadata

changes some of the show page metadata
adds iiif image viewer
moved openseadragon to vendor/assets and formatting fixes
create submodules for dataset viewers
use rails require and leaflet classes
slight modifications to iiif-viewer pull request
Merge pull request #204 from geoblacklight/iiif-viewer-jr-mods

slight modifications to iiif-viewer pull request
reverts schema, indents method, removes commented out test
Merge pull request #206 from geoblacklight/iiif-viewer-remove-cruft

reverts schema, indents method, removes commented out test
remove osd for leaflet-iiif
Merge pull request #207 from geoblacklight/iiif-viewer-switch-to-leaflet

remove osd for leaflet-iiif
adds arcgrid generated downloads and fixes downloadable?
Merge pull request #161 from geoblacklight/iiif-viewer

adds iiif image viewer
Merge pull request #208 from geoblacklight/add-arcgrid

adds arcgrid generated downloads and fixes downloadable? method
bump to 0.3.0 :gem::star2:
fixes issue where show page map would error, adds IIIF test, and pending for bug
subs spaces for hyphens in geomtype icon