Implement DataImport#dispatch to clarify main running paths
Implement DataImport#dispatch to clarify main running paths

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