Send email alert when tempmon server marks a client as offline

courtesy of Cole Chaney <cole@mamajeansmarket.com>

rattail_tempmon/server.py

@@ -83,6 +83,8 @@ class TempmonServerDaemon(Daemon):
         if not online and client.online:
             log.info("marking client as OFFLINE: {}".format(client))
             client.online = False
+            send_email(self.config, 'tempmon_client_offline', {"client":client, "now":localtime(self.config,self.now,from_utc=True)})
+
 
     def check_readings_for_probe(self, session, probe, cutoff):
         readings = session.query(tempmon.Reading)\