FEATURE: CORE-2204 - Add polygon and point as new datatypes to DataSpace

QA: This API isn't used by the frontend currently so there shouldn't be any UI-facing changes to test.
Address Evan's code review comments (log as WKB instead of JSON),
Replace Line/Polygon with MultiLine/MultiPolygon
Use WKT for transport within DSS instead of GeoJSON. GeoJSON is still the client-facing format.
Merge branch 'master' of http://github.com/socrata/data-coordinator into CORE-2204
Merging in order to push changes for Dataspace to speak Geo.