Introducing Ionic 2 (Video 15)

This video tutorial covers the implementation of a pull to refresh component in an Ionic application. It explains how to add the component to the template, bind it to its refresh event, and handle the refresh logic in JavaScript. The tutorial also demonstrates how to use the Lodash library to shuffle results and discusses the transition from Bower to NPM for managing front-end libraries. Additionally, it introduces keyboard interaction using Ionic's dependency injection. The video concludes with a brief overview of more advanced components and a preview of upcoming topics on user interactions.

What is the significance of the 'refresher' keyword in the context of the pull to refresh feature?

Describe the process of importing an external library in the project as mentioned in the text.