Gtfs: Fix duration fields
Gtfs: Fix duration fields

the duration field was not read for the GTFS parser

antoine-de/navitia,TeXitoi/navitia,kinnou02/navitia,pbougue/navitia,Tisseo/navitia,frodrigo/navitia,CanalTP/navitia,thiphariel/navitia,djludo/navitia,francois-vincent/navitia,lrocheWB/navitia,ballouche/navitia,fueghan/navitia,CanalTP/navitia,VincentCATILLON/navitia,thiphariel/navitia,prhod/navitia,datanel/navitia,datanel/navitia,kinnou02/navitia,prhod/navitia,fueghan/navitia,frodrigo/navitia,TeXitoi/navitia,is06/navitia,thiphariel/navitia,CanalTP/navitia,patochectp/navitia,TeXitoi/navitia,stifoon/navitia,fueghan/navitia,antoine-de/navitia,lrocheWB/navitia,francois-vincent/navitia,prhod/navitia,fueghan/navitia,VincentCATILLON/navitia,stifoon/navitia,VincentCATILLON/navitia,francois-vincent/navitia,Tisseo/navitia,lrocheWB/navitia,kadhikari/navitia,thiphariel/navitia,Tisseo/navitia,pbougue/navitia,xlqian/navitia,lrocheWB/navitia,djludo/navitia,kadhikari/navitia,frodrigo/navitia,stifoon/navitia,ballouche/navitia,djludo/navitia,prhod/navitia,kinnou02/navitia,frodrigo/navitia,CanalTP/navitia,CanalTP/navitia,is06/navitia,patochectp/navitia,xlqian/navitia,is06/navitia,TeXitoi/navitia,datanel/navitia,datanel/navitia,antoine-de/navitia,patochectp/navitia,kadhikari/navitia,VincentCATILLON/navitia,xlqian/navitia,pbougue/navitia,xlqian/navitia,is06/navitia,ballouche/navitia,francois-vincent/navitia,patochectp/navitia,kinnou02/navitia,Tisseo/navitia,pbougue/navitia,kadhikari/navitia,ballouche/navitia,stifoon/navitia,djludo/navitia,Tisseo/navitia,antoine-de/navitia,xlqian/navitia