Label trips that may compete with transit

[barbeau]

Is your feature request related to a problem? Please describe.
PR #12 adds OTP trip plans to the Chicago TNC trip dataset, so we can see what transit options were scheduled for that particular day and time.

We'd like to label trips that potentially competed with transit.

Describe the solution you'd like
So far we've discussed labeling trips that go through transit "hubs" or have 0 transfers accordingly in the output CSV. We could consider "hubs" to be stops that have location_type = 1 in GTFS stops.txt file.