kraken: compatibility with protobuf 2.4
kraken: compatibility with protobuf 2.4

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