Rest Swagger - support `allOf`

[hellosnow]

allOf should be supported according to Swagger schema object

"ParameterA": {
  "type": "object",
  "properties": {
    "error": {
      "$ref": "#/definitions/Object",
      "readOnly": true,
      "description": "sample"
    }
  },
  "allOf": [{
    "$ref": "#/definitions/ParameterB"
  }]
}