Add route assignment spec
Add Cargo loading rest api.
1. Implement pathfinder rest client
Now we can get possible route candidates by accessing
"/routes/{trackingId}"
Implements assigning cargo to route.
1. Now the cargo is not routed when it is registered.
1. Implements cargo itinerary query
Merge pull request #2 from Hippoom/assign-cargo-to-route

Assign cargo to route