Web Services Exercise

Overview:

Learn how to use Retrofit to perform web requests!

Procedure:

1. Clone repository.
2. Create a new branch off master; name the branch according to the form {name}/retrofit (e.g., robboyle/retrofit).
3. The app makes a GET request using HttpURLConnection; refactor the app, such that the same request is made using an instance of Retrofit.
4. Create a pull request against master.