Authenticate a user with email and password on FirebaseDB

authenticateFirebaseUser.js

dbRef.authWithPassword({
  email    : $('#loginEmail').val(),
  password : $('#loginPassword').val()
}, function(error, authData) {
  if (error) {
    console.log("Login Failed!", error);
  } else {
    console.log("Authenticated successfully with payload:", authData);
    auth  = authData;
  }
});