exposes DefaultResolveFn outside the lib

[chris-ramon]

Overview

• Build on top of Expose DefaultResolveFn to make it wrappable outside the library. #110 — thanks a lot @neglectedvalue
• Exposes DefaultResolveFn so can be wrapped outside the lib.

Test plan

• go test ./...

[coveralls]

Coverage remained the same at 82.105% when pulling b8d3ca6 on housinganywhere/expose-default-resolve-function into d5d756c on master.

[coveralls]

Coverage remained the same at 82.105% when pulling b8d3ca6 on housinganywhere/expose-default-resolve-function into d5d756c on master.