improve logging

adds timestamps, levels to each message.
each time the daemon is started a message is printed too

backend.py

@@ -19,8 +19,11 @@ if __name__ == '__main__':
     logger = logging.getLogger()
     fh = logging.FileHandler('/var/log/ticketfrei/backend.log')
     fh.setLevel(logging.DEBUG)
+    formatter = logging.Formatter('%(asctime)s %(levelname)8s: %(message)s')
+    fh.setFormatter(formatter)
     logger.addHandler(fh)
 
+    logger.info("Backend Daemon was started...")
 
     bots = []
     for ActiveBot in active_bots.__dict__.values():