code: public Story story(String name, Retrospective retrospective) {
          return story(name, retrospective, null);
      }
docs: Create a new story with a name. Set the story's IdentifiedIn to the given
  retrospective and the project to the retrospective's project.
  
  @param name          The initial name of the story.
  @param retrospective The retrospective this story was identified in.
  @return A newly minted Story that exists in the VersionOne system.