Method constructor

src/PromiseRouter.js:38–42

(routes = [], appId)

  //     response: a json object with the content of the response
  //     location: optional. a location header
  constructor(routes = [], appId) {
    this.routes = routes;
    this.appId = appId;
    this.mountRoutes();
  }

  // Leave the opportunity to
  // subclasses to mount their routes by overriding