fix(StopTime): add hashCode and equals method

src/main/java/com/conveyal/gtfs/model/StopTime.java

@@ -9,6 +9,7 @@
 import java.sql.PreparedStatement;
 import java.sql.SQLException;
 import java.util.Iterator;
+import java.util.Objects;
 
 /**
  * Represents a GTFS StopTime. Note that once created and saved in a feed, stop times are by convention immutable
@@ -141,4 +142,17 @@ public StopTime clone () {
             throw new RuntimeException(e);
         }
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        StopTime stopTime = (StopTime) o;
+        return arrival_time == stopTime.arrival_time && departure_time == stopTime.departure_time && stop_sequence == stopTime.stop_sequence && pickup_type == stopTime.pickup_type && drop_off_type == stopTime.drop_off_type && Double.compare(stopTime.shape_dist_traveled, shape_dist_traveled) == 0 && timepoint == stopTime.timepoint && Objects.equals(trip_id, stopTime.trip_id) && Objects.equals(stop_id, stopTime.stop_id) && Objects.equals(stop_headsign, stopTime.stop_headsign);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(trip_id, arrival_time, departure_time, stop_id, stop_sequence, stop_headsign, pickup_type, drop_off_type, shape_dist_traveled, timepoint);
+    }
 }