Only create tables & associated indexes for filenames not in agencies.exclude (#119)
Only create tables & associated indexes for filenames not in agencies.exclude (#119)

- Empty tables currently get created regardless of whether filenames are listed in agency.exclude 
- The agency.exclude list is checked for the filename prior to importing data into the table
- This leaves empty tables in the database without any data in them for any files in agency.exclude
- This change modifies that behavior to only create tables for files not listed in agency.exclude
BlinkTagInc/node-gtfs,BlinkTagInc/node-gtfs,BlinkTagInc/node-gtfs,brendannee/node-gtfs