func handleRegister(email:String, password:String, username:String) {

    //Create User
    FIRAuth.auth()?.createUser(withEmail: email, password: password, completion: { (user, err) in

        if err != nil {
            print(err!.localizedDescription)
            return
        }

        //Success! User Created!

        if let userID = user?.uid {

            //Create User Profile
            let databaseRef = FIRDatabase.database().reference()
            let usersRef = databaseRef.child("Users").child(userID)

            let usernameValue = ["username":username]

            usersRef.updateChildValues(usernameValue, withCompletionBlock: { (err, ref) in

                if err != nil {
                    print(err!.localizedDescription)
                    return
                }

                //Profile created and updated!

            })

        }

    })

}