added construction of export url using SlateAdmin.API.buildUrl so that URL will be constructed with appropriate hostname/protocol
added construction of export url using SlateAdmin.API.buildUrl so that URL will be constructed with appropriate hostname/protocol

SlateFoundation/slate-admin,SlateFoundation/slate-admin,SlateFoundation/slate,SlateFoundation/slate,SlateFoundation/slate-admin,SlateFoundation/slate-admin,SlateFoundation/slate,SlateFoundation/slate,SlateFoundation/slate,SlateFoundation/slate-admin