[importer] Implement ShpLoader#valid_table_names
[importer] Implement ShpLoader#valid_table_names

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