Maintaining session

Everytime I close and reopen the app, I will have to relogin from beginning. it would be better if it stores the session until I logout.

[aliwaqassi]

@devcer you have to check onAuthStateChanged

firebase.auth().onAuthStateChanged(function(user) {
if (user) {
  // User is signed in.
 this.nav.setRoot('home');
} else {
  // No user is signed in.
this.nav.setRoot('loginPage');
}
});