stop method
Stops evaluating the GeotriggerMonitor.
Stopping the GeotriggerMonitor prevents the condition from being evaluated and notifications from being sent. If you are using a LocationGeotriggerFeed created from a LocationDataSource, the data source must also be stopped to turn off GPS receivers etc.
When the GeotriggerMonitor is stopped, the GeotriggerMonitor.status will be GeotriggerMonitorStatus.stopped.