Finale version of the project

[eaesmat]

This pull request contains the following changes

1. Use JavaScript to make websites dynamic and build basic single page apps.
2. Use ES6 syntax.
3. Use ES6 modules.
4. Use callbacks and promises.
5. Use webpack.
6. Apply JavaScript best practices and language style guides in code.
7. Use AAA pattern for unit tests.
8. Write units tests for a JavaScript app.
9. Follow Gitflow.
10. Solve simple git conflicts.
11. Send and receive data from an API.
12. Use API documentation.
13. Understand and use JSON.
14. Make JavaScript code synchronous.