added plantUML support

fixed bug with subscription being notified multiple times

conf/log.yml

@@ -1,18 +0,0 @@
-version: 1
-disable_existing_loggers: True
-handlers:
-  console:
-    class : logging.StreamHandler
-    formatter: default
-    level   : INFO
-    stream  : ext://sys.stdout
-formatters:
-  brief:
-    format: '%(message)s'
-  default:
-    format: '%(asctime)s %(levelname)-8s %(name)-15s %(threadName)s %(message)s'
-    datefmt: '%Y-%m-%d %H:%M:%S'
-loggers:
-  root:
-    handlers: [console]
-    level: INFO