Use process.stdin as default argument for listen()

Replace { fd: 0 } with process.stdin, which should have
better compatibility with Windows.

Partial fix for #18

index.js

@@ -57,6 +57,6 @@ if (process.platform === "win32") {
     }
 } else {
     exports.isService = function () {
-        return fs.fstatSync(0).isSocket();
+        return fs.fstatSync(process.stdin.fd).isSocket();
     }
 }

lib/server.js

@@ -111,7 +111,7 @@ Server.prototype.listen = function (callback) {
         return net.Server.prototype.listen.apply(this, arguments);
     }
 
-    return net.Server.prototype.listen.call(this, { fd: 0 }, callback);
+    return net.Server.prototype.listen.call(this, process.stdin, callback);
 };
 
 Server.prototype.setTimeout = function (msecs, callback) {