[IMP] Added keywords to conf2xml and fixed contrib
[IMP] Added keywords to conf2xml and fixed contrib

	- Added keywords to conf2xml export
	- Updated contribs to export keywords as done for conferences
	- fixed replace bug (replace without assignment)

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