separate column data type conversion to its own class
separate column data type conversion to its own class

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