修复未登录时点击需要登录验证的页面，跳转到登录页，登录成功后不能跳转到登录前点击的页面的bug

Code Review By Rock Zhang

@@ -34,7 +34,7 @@ class HomeController extends AbstractAction
     {
         $uid = $this->getUid($useSession);
         if (!$uid) {
-            $this->go(Helpers::url('/signin.html', array('refer' => $this->server('HTTP_REFERER', SITE_MAIN))));
+            $this->go(Helpers::url('/signin.html', array('refer' => Helpers::url($this->server('REQUEST_URI', '/home')))));
         }
     }