Adding level checks on dynamic logging

using levels.toLevel and this.isLevelEnabled prior to emiting the event will prevent the appenders from being notified if the log level provided is below the loggers level.

lib/logger.js

@@ -49,9 +49,12 @@ Logger.prototype.removeLevel = function() {
 
 Logger.prototype.log = function() {
   var args = Array.prototype.slice.call(arguments)
-  , logLevel = args.shift()
-  , loggingEvent = new LoggingEvent(this.category, logLevel, args, this);
-  this.emit("log", loggingEvent);
+  , logLevel = levels.toLevel(args.shift())
+  , loggingEvent;
+  if (this.isLevelEnabled(logLevel)) {
+    loggingEvent = new LoggingEvent(this.category, logLevel, args, this);
+    this.emit("log", loggingEvent);
+  }
 };
 
 Logger.prototype.isLevelEnabled = function(otherLevel) {