prepare version 2.5.0
GTFS export should not require line number, Mantis 26726
GTFS Import : affect trips past midnight on next days, Mantis 25824
GTFS import crashes when a trip crosses a same stop more than twice, Mantis 26755
NeTEx export produce invalid file on missing versionDate in Network object, Mantis 26434
merge V2_4
protect validation from missing coordinates, Mantis 26931
adapt to java 6 limitations
set version to 2.4.1
protect Zip import from Windows encoding entry names, Mantis 27011