replaced my debug lib with standard one

lib/streams/DateRollingFileStream.js

@@ -1,6 +1,6 @@
 "use strict";
 var BaseRollingFileStream = require('./BaseRollingFileStream')
-, debug = require('../debug')('DateRollingFileStream')
+, debug = require('debug')('log4js:DateRollingFileStream')
 , format = require('../date_format')
 , async = require('async')
 , fs = require('fs')
@@ -9,7 +9,7 @@ var BaseRollingFileStream = require('./BaseRollingFileStream')
 module.exports = DateRollingFileStream;
 
 function DateRollingFileStream(filename, pattern, options, now) {
-  debug("Now is " + now);
+  debug("Now is ", now);
   if (pattern && typeof(pattern) === 'object') {
     now = options;
     options = pattern;
@@ -31,7 +31,7 @@ function DateRollingFileStream(filename, pattern, options, now) {
       options = null; 
     }
   }
-  debug("this.now is " + this.now + ", now is " + now);
+  debug("this.now is ", this.now, ", now is ", now);
   
   DateRollingFileStream.super_.call(this, filename, options);
 }
@@ -41,8 +41,8 @@ DateRollingFileStream.prototype.shouldRoll = function() {
   var lastTime = this.lastTimeWeWroteSomething,
   thisTime = format.asString(this.pattern, new Date(this.now()));
   
-  debug("DateRollingFileStream.shouldRoll with now = " + 
-        this.now() + ", thisTime = " + thisTime + ", lastTime = " + lastTime);
+  debug("DateRollingFileStream.shouldRoll with now = ", 
+        this.now(), ", thisTime = ", thisTime, ", lastTime = ", lastTime);
   
   this.lastTimeWeWroteSomething = thisTime;
   this.previousTime = lastTime;
@@ -81,7 +81,7 @@ DateRollingFileStream.prototype.roll = function(filename, callback) {
   }
 
   function renameTheCurrentFile(cb) {
-    debug("Renaming the " + filename + " -> " + newFilename);
+    debug("Renaming the ", filename, " -> ", newFilename);
     fs.rename(filename, newFilename, cb);
   }