[importer] Preprocess JSON files in Loader
[importer] Preprocess JSON files in Loader

CartoDB/cartodb,splashblot/dronedb,codeandtheory/cartodb,bloomberg/cartodb,DigitalCoder/cartodb,nuxcode/cartodb,DigitalCoder/cartodb,thorncp/cartodb,future-analytics/cartodb,raquel-ucl/cartodb,future-analytics/cartodb,bloomberg/cartodb,CartoDB/cartodb,CartoDB/cartodb,UCL-ShippingGroup/cartodb-1,DigitalCoder/cartodb,DigitalCoder/cartodb,thorncp/cartodb,codeandtheory/cartodb,splashblot/dronedb,CartoDB/cartodb,splashblot/dronedb,nyimbi/cartodb,raquel-ucl/cartodb,bloomberg/cartodb,raquel-ucl/cartodb,codeandtheory/cartodb,bloomberg/cartodb,UCL-ShippingGroup/cartodb-1,nyimbi/cartodb,CartoDB/cartodb,dbirchak/cartodb,nyimbi/cartodb,DigitalCoder/cartodb,nuxcode/cartodb,thorncp/cartodb,raquel-ucl/cartodb,UCL-ShippingGroup/cartodb-1,dbirchak/cartodb,future-analytics/cartodb,dbirchak/cartodb,codeandtheory/cartodb,nyimbi/cartodb,raquel-ucl/cartodb,splashblot/dronedb,nuxcode/cartodb,dbirchak/cartodb,UCL-ShippingGroup/cartodb-1,nuxcode/cartodb,nyimbi/cartodb,splashblot/dronedb,future-analytics/cartodb,thorncp/cartodb,UCL-ShippingGroup/cartodb-1,codeandtheory/cartodb,bloomberg/cartodb,thorncp/cartodb,dbirchak/cartodb,future-analytics/cartodb,nuxcode/cartodb