allow multi-registrant competitors' ID to be multi-lines
allow multi-registrant competitors' ID to be multi-lines

rdunlop/unicycling-registration,scotthue/unicycling-registration,rdunlop/unicycling-registration,scotthue/unicycling-registration,rdunlop/unicycling-registration,scotthue/unicycling-registration,rdunlop/unicycling-registration