Automatically update routes & trips data

[paigeruten]

import_data.php could be run on a cron at like 3am every night, but it seems like they update the routes & trips data a good week in advance of when the route changes go into effect, so for that week all of the buses would have an (Unknown route).

Maybe the import_data.php should instead be triggered when a certain percentage of buses all have an (Unknown route), so then the data would hopefully be updated at the same time as the buses.