trigger() {
    const {
      container: {
        offsetWidth,
        offsetHeight
      },
      resolution
    } = this;

    const width = Number(offsetWidth * resolution.x).toFixed();
    const height = Number(offsetHeight * resolution.y).toFixed();

    this.callbacks.forEach(cb => {
      cb(width, height);
    });
  }
@method trigger
@instance
@description Triggers resize when called. width & height are determined automatically
This invokes each callbacks with the new width and height as params
@memberof module:modules/app.ResizeModule