anchor.diff:  (this is a future feature.)
   --
   
  -Returns all the NAICS codes that contain search terms in the title, description, illustrative example, or index listing.
  +Returns all the NAICS codes that contain search terms in the title, description, illustrative example, or index listing. NOT IMPLEMENTED
   GET /search{?terms}
   < 200
  -{ "receipt": "/payment/receipt/1" }+[
  +    {
  +        "seq_no": 1402,
  +        "code": 51,
  +        "title": "Information",
  +        "change_indicator": 0,
  +        "trilateral": 1
  +    },
  +    {
  +        "seq_no": 1470,
  +        "code": 519,
  +        "title": "Other Information Services",
  +        "change_indicator": 0,
  +        "trilateral": 1
  +    },
  +    {
  +        "seq_no": 1471,
  +        "code": 5191,
  +        "title": "Other Information Services",
  +        "change_indicator": 0,
  +        "trilateral": 1
  +    },
  +    {
  +        "seq_no": 1474,
  +        "code": 51912,
  +        "title": "Libraries and Archives",
  +        "change_indicator": 0,
  +        "trilateral": 1
  +    }
  +]
positive.code: < 200
  < Content-Type: application/json
  {
    "seq_no": 1475,
    "code": 519120,
    "title": "Libraries and Archives",
    "change_indicator": 0,
    "trilateral": 0
  }
  
  Get all NAICS codes above in the hierarchy of the requested code.
  GET /q?{?year,code,above}
  < 200
  < Content-Type: application/json
  {
    "seq_no": 1475,
    "code": 519120,
    "title": "Libraries and Archives",
    "change_indicator": 0,
    "trilateral": 0
  }
  
  Get all NAICS codes below in the hierarchy of the requested code.
  GET /q?{?year,code}
  < 200
  < Content-Type: application/json
  {
  
negative.code: < 200
  < Content-Type: application/json
  {
      "name": "2012 NAICS Codes",
      "year": 2012,
      "items": [
          {
              "seq_no": 1,
              "code": 11,
              "title": "Agriculture, Forestry, Fishing and Hunting",
              "change_indicator": 0,
              "trilateral": 1
          },
          {
              ...
          }
      ]
  }
  
  Get a single NAICS code.
  