Changes to make all of the responses consistent (previously, some of the responses were not using the same format as is used in the current version of Razor).  Also added the "GET" on images by UUID back into the API (again, to make it more consistent with the API used in Razor v1) and changed the names of the utility methods used to construct the responses back to the user by Razor to make it clearer what they were returning (from response_with_status_web to slice_success_object_array and from slice_success_web to slice_success_response).  Finally, got rid of the local references to the slice framework (replacing them all with a class-level constant that refers to an appropriate slice object in each part of the API).