Retrieve either all notifications or the notifications attached to a specific event.
            If successful, result can be obtained by a call to getResponse(), and should be a json string.
            
            @param event_notification_id (int) (optional) - Id of the event-notification to retrieve details from.
            
            @return (bool) - Boolean indicating whether EventsNotificationsGet was successful.

def EventsNotificationsGet(self, event_notification_id = -1):
        """
            Retrieve either all notifications or the notifications attached to a specific event.
            If successful, result can be obtained by a call to getResponse(), and should be a json string.
            
            @param event_notification_id (int) (optional) - Id of the event-notification to retrieve details from.
            
            @return (bool) - Boolean indicating whether EventsNotificationsGet was successful.
        """
        if event_notification_id == -1:
            url = '/events/notifications.json'
        else:
            url = '/events/notifications/{0}.json'.format(event_notification_id)

        if self.__SenseApiCall__(url, 'GET'):
            return True
        else:
            self.__error__ = "api call unsuccessful"
            return False