ed, routing, jormungandr et al: from shapes.txt to GeoJson

From reading a shapes.txt with the gtfs connector to giving a beautiful GeoJson in a public transport section.

Fix http://jira.canaltp.fr/browse/NAVITIAII-410
roh it's possible to catch narrower exception no ? (or no exception at all there)
if you test the shape_id_c after that you just have to test the existence in the shapes map