add methos to check if history is at beggining or end
add methos to check if history is at beggining or end

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