Change to address Issue #1 in example

.gitignore

@@ -0,0 +1,2 @@
+build
+.lock*

helloworld/test.js

@@ -0,0 +1,3 @@
+var helloWorld = require('./build/Release/helloworld');
+var world = new helloWorld.HelloWorld();
+console.log(world.hello());

helloworld_eio/helloworld_eio.cc

@@ -87,15 +87,13 @@ class HelloWorldEio: ObjectWrap
   }
 
 
-  static int EIO_Hello(eio_req *req)
+  static void EIO_Hello(eio_req *req)
   {
     hello_baton_t *baton = static_cast<hello_baton_t *>(req->data);
 
     sleep(baton->sleep_for);
 
     baton->hw->m_count += baton->increment_by;
-
-    return 0;
   }
 
   static int EIO_AfterHello(eio_req *req)

helloworld_eio/test.js

@@ -0,0 +1,8 @@
+var helloeio = require('./build/Release/helloworld_eio');
+var hi = new helloeio.HelloWorldEio();
+hi.hello(function(data){
+   console.log(data);
+});
+//Outputting something here to show that the callback is non-blocking and this
+//output will be displayed before the Hello World message.
+console.log('Outputted after the async call to hello world.');