anchor.diff:  A collection of a single Prompt object's responses.
   
   + Parameters
  -    + slug (required, string,  `basics`) ... String `slug` of the Prompt to retrieve Responses.
  +    + slug (required, string, `basics`) ... String `slug` of the Prompt to retrieve Responses.
       
   ### Retrieve a Prompts Responses [GET]
   + Response 200 (application/json)
  
positive.code:             "prompt": "Show me how you would improve this autobiography document.",
              "slug": "improve",
              "url": "http://atomic.logsdon.io/prompts/improve",
              "response": { ... },
              "created_at": "2014-03-14 14:13:00"
          }]
          
  
negative.code:                     "other_links": null,
                      "is_united_states_citizen_or_permanent_resident": true
                  },
                  "url": "http://atomic.logsdon.io/responses/1",
                  "prompt_id": 1,
                  "created_at": "2014-03-15 20:00:00"
              }]