added include <iterator> to make windows happy (I hope)
added include <iterator> to make windows happy (I hope)

cellml/libcellml,hsorby/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,cellml/libcellml