Restrict which types can have minimum and maximum values

[gheine]

Currently, minimum and maximum values can be applied all types, when they really only make sense for integer types (integer, long) and sequences (string, list).

Example:

  "name": "test",
  "base_url": "http://localhost.com",
  "apidoc": {
    "version": "0.11.48"
  },
  "models": {
    "foo": {
      "fields": [
        { 
          "name": "id",
          "type": "boolean"
        }
      ]
    },
    "test": {
      "fields": [
        {
          "name": "id",
          "type": "foo",
          "minimum": 0,
          "maximum": 10
        }
      ]
    }
  },
  "resources": {
    "test": {
      "operations": [
        {
          "method": "GET",
          "path": "/foo",
          "parameters": [
            {
              "name": "some_id",
              "type": "boolean",
              "location": "query",
              "minimum": 0,
              "maximum": 10
            }
          ],
          "responses": {
            "204": { "type": "unit" }
          }
        }
      ]
    }
  }
}