make default bounds. closes #145
make default bounds. closes #145

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