public static function createOrUpdate($id = null, array $data)
  {

    $user = new User;

    $user->account_id             = $data['account_id'];
    $user->role                   = $data['role'];
    $user->email                  = $data['email'];
    $user->username               = $data['username'];
    $user->password               = $data['password'];
    $user->password_confirmation  = $data['password_confirmation'];
    $user->first_name             = $data['first_name'];
    $user->last_name              = $data['last_name'];
    $user->phone                  = $data['phone'];
    
    if(!$user->save())
    {
      return Redirect::to('register')->withErrors($user->errors()->all());
    }
    else
    {
      Auth::login($user, true);
      return Redirect::to('/appointments')->with('message', 'Your registration is complete and you are now logged in.');
    }
  }