added option to set type to cause browser to open a save as dialog
added option to set type to cause browser to open a save as dialog

teharrison/MG-RAST,paczian/MG-RAST,teharrison/MG-RAST,paczian/MG-RAST,paczian/MG-RAST,teharrison/MG-RAST,paczian/MG-RAST,MG-RAST/MG-RAST,MG-RAST/MG-RAST,MG-RAST/MG-RAST,teharrison/MG-RAST,MG-RAST/MG-RAST,teharrison/MG-RAST,paczian/MG-RAST,paczian/MG-RAST,teharrison/MG-RAST,MG-RAST/MG-RAST