code: public Observable<ImageList> getDetailsAsync(String listId) {
          return getDetailsWithServiceResponseAsync(listId).map(new Func1<ServiceResponse<ImageList>, ImageList>() {
              @Override
              public ImageList call(ServiceResponse<ImageList> response) {
                  return response.body();
              }
          });
      }
docs: Returns the details of the image list with list Id equal to list Id passed.
  
  @param listId List Id of the image list.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ImageList object