Revert "Tweak log formating to append colon and space to stdout type."

This reverts commit 246fdaece6.

lib/logger.js

@@ -18,9 +18,9 @@ Logger.prototype = {
   log: function (msg, type) {
     if (this.backend == 'stdout') {
       if (!type) {
-        type = 'DEBUG';
+        type = 'DEBUG: ';
       }
-      this.util.log(type + ": " + msg);
+      this.util.log(type + msg);
     } else {
       if (!type) {
         type = this.level