replaced 'sys' with 'util' (issue #42)

lib/log4js.js

@@ -47,7 +47,7 @@
 var events = require('events')
 , fs = require('fs')
 , path = require('path')
-, sys = require('sys')
+, util = require('util')
 , layouts = require('./layouts')
 , levels = require('./levels')
 , consoleAppender = require('./appenders/console').appender
@@ -143,7 +143,7 @@ function configureAppenders(appenderList) {
             if (appender) {
                 addAppender(appender, appenderConfig.category);
             } else {
-                throw new Error("log4js configuration problem for "+sys.inspect(appenderConfig));
+                throw new Error("log4js configuration problem for "+util.inspect(appenderConfig));
             }
         });
     } else {
@@ -198,7 +198,7 @@ function Logger (name, level) {
         this.__proto__.level = levels.TRACE;
     }
 }
-sys.inherits(Logger, events.EventEmitter);
+util.inherits(Logger, events.EventEmitter);
 
 Logger.prototype.setLevel = function(level) {
     this.level = levels.toLevel(level, levels.TRACE);
@@ -280,7 +280,7 @@ function configureOnceOff(config) {
             configureAppenders(config.appenders);
             configureLevels(config.levels);
         } catch (e) {
-            throw new Error("Problem reading log4js config " + sys.inspect(config) + ". Error was \"" + e.message + "\" ("+e.stack+")");
+            throw new Error("Problem reading log4js config " + util.inspect(config) + ". Error was \"" + e.message + "\" ("+e.stack+")");
         }
     }
 }