Since all the routes tests do the same common setup and tear down, they

have been refactored to call a method which returns all the common data

used in the tests (repositories, config instance, etc.) and a way to

tear it down.
We now also pass config.Config objects by their address since they

contain pointer types (specifically the Repositories field) to make it

clear that any function receiving them may modify them. Previously it

was possible to modify their pointer fields even if passed by value.

Ran go fmt ./....

Ran make test.

Ran make integration-tests.