make a more synchronous version possible

README.md

@@ -24,12 +24,11 @@ Usage
 
 Both Asynchronous and Synchronous versions are provided.
 
-The Synchronous version still uses callbacks, so it is safe to use with other Asynchronous functions and will still work as expected.
-
-    var walk = require('walk'),
-      fs = require('fs'),
-      options,
-      walker;
+var walk = require('walk')
+  , fs = require('fs')
+  , options
+  , walker
+  ;
 
 options = {
     followLinks: false,
@@ -71,6 +70,51 @@ The Synchronous version still uses callbacks, so it is safe to use with other As
 walker.on("end", function () {
   console.log("all done");
 });
+```
+### Async
+
+The Synchronous version can operate without a callback if the event handlers are passed in
+
+```javascript
+var walk = require('walk')
+  , fs = require('fs')
+  , options
+  , walker
+  ;
+
+options = {
+    listeners: {
+        names: function (root, nodeNamesArray) {
+          nodeNames.sort(function (a, b) {
+            if (a > b) return 1;
+            if (a < b) return -1;
+            return 0;
+          });
+        }
+      , directories: function (root, dirStatsArray, next) {
+          // dirStatsArray is an array of `stat` objects with the additional attributes
+          // * type
+          // * error
+          // * name
+          
+          next();
+        }
+      , file: function (root, fileStats, next) {
+          fs.readFile(fileStats.name, function () {
+            // doStuff
+            next();
+          });
+        }
+      , errors: function (root, nodeStatsArray, next) {
+          next();
+        }
+    }
+};
+
+walker = walk.walkSync("/tmp", options);
+
+console.log("all done");
+```
 
 API
 ====