socket: fixed force disconnect URI

Author: rauchg

lib/socket.js

@@ -355,14 +355,14 @@
   Socket.prototype.disconnectSync = function () {
     // ensure disconnection
     var xhr = io.util.request();
- 	var uri = [
- 	     'http' + (this.options.secure ? 's' : '') + ':/'
- 	     , this.options.host + ':' + this.options.port
- 	     , this.options.resource
- 	     , io.protocol
- 	     , this.sessionid
- 	     ].join('/'); 
-         
+    var uri = [
+        'http' + (this.options.secure ? 's' : '') + ':/'
+      , this.options.host + ':' + this.options.port
+      , this.options.resource
+      , io.protocol
+      , this.sessionid
+    ].join('/') + '?disconnect';
+
     xhr.open('GET', uri, true);
     xhr.send(null);