Refs #73 - Add ObjectResponse class.
Refs #73 - If an ArraySerializable is returned by a rest method, wrap it in an ObjectResponse.
Refs #73 - Add createObjectResponse method to AbstractController.
Refs #73 - Add missing 'use'.
Refs #73 - Use type hint instead of manual type check.
Refs #73 - Make first argument to ObjectResponse constructor required.
Merge pull request #73 from synapsestudios/feature/73-create-entity-response-class-that-rest-methods-can-return

Create EntityResponse class that REST methods can return