Make DataRepository::Collection#storage public so we can override it from Visualization and Collection repositories
Make DataRepository::Collection#storage public so we can override it from Visualization and Collection repositories

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