add flush dns cache

src/main/scala/com/github/shadowsocks/ShadowsocksApplication.scala

@@ -1,5 +1,6 @@
-/* Shadowsocks - A shadowsocks client for Android
- * Copyright (C) 2012 <max.c.lv@gmail.com>
+/*
+ * Shadowsocks - A shadowsocks client for Android
+ * Copyright (C) 2013 <max.c.lv@gmail.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -44,4 +45,4 @@ class ShadowsocksApplication extends Application {
   override def onCreate() {
     EasyTracker.getInstance.setContext(this)
   }
-}
+}