add json format to the export_project_individuals API
add json format to the export_project_individuals API

ssadedin/seqr,macarthur-lab/xbrowse,macarthur-lab/xbrowse,macarthur-lab/seqr,macarthur-lab/seqr,macarthur-lab/xbrowse,macarthur-lab/xbrowse,ssadedin/seqr,ssadedin/seqr,ssadedin/seqr,ssadedin/seqr,macarthur-lab/xbrowse,macarthur-lab/xbrowse,macarthur-lab/seqr,macarthur-lab/seqr,macarthur-lab/seqr