Gtfs data

Checks for GTFS data acceptable format

1. The txt files are on the top level of the zip file, not in a subdirectory.
2. stop_times.txt doesn't include the column shape_dist_traveled unless shapes.txt includes the same column.

An example command to fix check #2 for Helsinki GTFS data (remove last column in the file): sed -i.orig -e 's/,[^,]*$//' stop_times.txt

Nice to have optional information

1. shapes.txt so that the routes are drawn along the roads and tracks on the map user interface.
2. Wheelchair accessibility columns in trips.txt and stops.txt.