This patch updates our internals to return objects from Repository

methods instead of just returning raw responses. This moves the

serialization code into the API endpoints, instead of having it in every

Repository implementation. This also allows our tests to compare these

structures directly, instead of re-parsing the JSON into a private

struct.
Additionally, the Git unit tests have been updated to use

assert.Equal(expected, actual), which is what the library expects.

Ran go fmt ./....

Ran go test ./....