Need to support maps and interfaces as definition

[anilsenay]

• Need to support maps:

response.New(map[string]string{"field1": "value", "field2": "value"}, "OK", "200")
response.New(map[string]interface{}{"field1": "value", "field2": 12345}, "OK", "200")

• Need to support interfaces:

type SuccessResponse struct{
  StatusCode int `json:"status"`
  Data interface{} `json:"data"`
}

response.New(SuccessResponse{ Data: SomeStruct{} }, "OK", "200")