change to spatial representation in DPLA export

Per Scott at DPLA:

Thanks all -- here are the mocked revisions to spatial representation for DLG

// OLD "dcterms_spatial_display": [ "United States, Alabama, Jefferson County, Birmingham, 33.5206608, -86.80249", "United States, Alabama, Mobile" ],

// NEW "dcterms_spatial_display": [ { "names": [ "United States", "Alabama", "Jefferson County", "Birmingham", ], "coordinates": "33.5206608, -86.80249", "uri": "geonames.org/134124124" }, { "names": [ "United States", "Alabama", "Mobile" ] } ]