- Make use of the route url value included in National Express ZR
records.
- When setting GTFS routes.txt values from route+direction specific
ATCO-CIF records, we now allow you to specify a preferred ordering of
direction ids to use when looking for direction-specific records to use.
Add support for pruning trips that have missing stops.
Fix typo.
Make stop and trip pruning for stops with no location information the
default mode.  Update docs accordingly.