Authentication with Firebase

To allow users to log in/sign up for our app, we need to do three things:

1. Turn on email authentication on the Firebase console.
2. Submit the email and password in our form to Firebase when the user clicks on the button.
3. Either sign up or log in the user based on the result.

Let’s open up our Firebase console (https://console.firebase.google.com) and get to work on task #1:

1. From our Chatastrophe project page, click on Authentication.
2. Under the SIGN-IN METHOD tab, you can see all the options that Firebase provides. These authentication solutions are huge boons to developers, as configuring authentication can be tricky (especially when working with third-party APIs, such as Twitter or Facebook). There's a lot of infrastructure to create to provide the proper security. Firebase takes care of that for us, so all we have to worry about is tapping...