adding log rotation to the logger

lib/Logger.js

@@ -4,10 +4,21 @@ function Logger( config ){
 
   var transports;
   if ( config.logfile ){
+
+    // we need a dir to do log rotation so we get the dir from the file
+    var logpath = config.logfile.split('/');
+    logpath.splice(-1,1);
+    logpath = logpath.join('/');
+
     transports = [
       // keep logging errors to the console (may not be needed)
-      //new (winston.transports.Console)({ level: 'error' }),
-      new (winston.transports.File)({ filename: config.logfile, level: 'debug' })
+      new (winston.transports.DailyRotateFile)({
+        filename: config.logfile,
+        dirname: logpath,
+        datePattern: '.yyyy-MM-dd',
+        colorize: true,
+        level: 'debug'
+      })
     ];
   } else {
     // no logfile defined, log to console only