Add contribution references in timetable json export
Add contribution references in timetable json export

mic4ael/indico,mic4ael/indico,OmeGak/indico,indico/indico,ThiefMaster/indico,mvidalgarcia/indico,OmeGak/indico,DirkHoffmann/indico,pferreir/indico,mic4ael/indico,OmeGak/indico,pferreir/indico,OmeGak/indico,pferreir/indico,ThiefMaster/indico,ThiefMaster/indico,indico/indico,indico/indico,indico/indico,ThiefMaster/indico,mvidalgarcia/indico,mvidalgarcia/indico,DirkHoffmann/indico,DirkHoffmann/indico,pferreir/indico,mvidalgarcia/indico,mic4ael/indico,DirkHoffmann/indico