Other types of relationships aren't brought in

[queenvictoria]

Petstore swagger references are imported by the recent change.

      "properties": {
//...
        "tags": {
          "type": "array",
          "xml": {
            "name": "tag",
            "wrapped": true
          },
          "items": {
            "$ref": "#/definitions/Tag"
          }
        },
     }

However swagger generated by holiday/jsonapi-server relationships aren't

      "properties": {
//...
        "attributes": {
//...
        },
        "relationships": {
          "type": "object",
          "properties": {
            "concepts": {
              "type": "object",
              "properties": {
                "meta": {
                  "type": "object"
                },
                "links": {
                  "type": "object",
                  "properties": {
                    "self": {
                      "type": "string"
                    },
                    "related": {
                      "type": "string"
                    }
                  }
                },