Library module with some very basic helper methods for working with GeoJSON objects.

• detectDupeCoords(geoJsonFeature) - find any duplicate points in GeoJSON Feature. Return list of points.
• removeDupeCoords(geoJsonFeature) - remove duplicate points from GeoJSON Feature, keeping the first. Return new cleaned object.
• detectAndRemoveDupeCoords(geoJsonFeature) - Check for duplicates, print any that are found and remove them.