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
  {
    "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.
  
negative.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": 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
      }
  ]
  
  Get all NAICS codes below in the hierarchy of the requested code.
  GET /q?{?year,code,below}
  < 200
  < Content-Type: application/json
  {
  