add log.py and imports in cog-files to that. Part of #26

log.py

@@ -0,0 +1,28 @@
+import logging
+import sys
+
+FORMATTER = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
+LOG_FILE = "jeeves.log"
+
+def get_console_handler():
+	console_handler = logging.StreamHandler(sys.stdout)
+	console_handler.setFormatter(FORMATTER)
+	return console_handler
+
+def get_file_handler():
+	file_handler = logging.FileHandler(LOG_FILE, encoding='utf-8', mode='a')
+	file_handler.setFormatter(FORMATTER)
+	return file_handler
+
+def get_logger(logger_name):
+	logger = logging.getLogger(logger_name)
+
+	logger.setLevel(logging.DEBUG) # better to have too much log than not enough
+
+	logger.addHandler(get_console_handler())
+	logger.addHandler(get_file_handler())
+
+	# with this pattern, it's rarely necessary to propagate the error up to parent
+	logger.propagate = False
+
+	return logger