model() {
    return new Promise((resolve) => {
      this.applicationBooted = ({ booted }) => {
        if (booted) {
          this.port.off('general:applicationBooted', this.applicationBooted);
          this.applicationBooted = null;
          resolve();
        }
      };
      this.port.on('general:applicationBooted', this.applicationBooted);
      this.port.send('general:applicationBooted');
    });
  }
Sends a request to ember-debug to figure out whether
the ember-app has booted so that we can start inspecting!

@return {Promise}