Update loading_data.md
Update loading_data.md

add curl option to save file
Ecotrust/marineplanner-core,Ecotrust/marineplanner-core,Ecotrust/marineplanner-core,Ecotrust/marineplanner-core,Ecotrust/marineplanner-core,MidAtlanticPortal/marco-portal2,MidAtlanticPortal/marco-portal2,MidAtlanticPortal/marco-portal2,MidAtlanticPortal/marco-portal2