add nabsa station names

[mpadge]

The NABSA systems (Philly, LA) have all station coordinates in the trip data files, with station files containing only station numbers, names, dates, and operating status. These station files could at least be used to insert names into the station tables, which these systems currently lack. This would be a bit tricky only because the station data are inserted into the SQLite station table during reading of the raw data files, so it would require subsequent modification of the existing table.