/**
  * Authenticate and return a seeded gapi instance
  *
  * @param String $email
  * @param String $password
  * @return gapi
  */
 public static function authenticate($email, $password)
 {
     $auth_method = new gapiClientLogin();
     $auth_method->fetchToken($email, $password);
     return new gapi($auth_method);
 }