Add "Logout" button.

logout.htm

@@ -0,0 +1 @@
+Logged out

plugins/dynamix/LogoutButton.page

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+Cond="file_exists('/etc/nginx/htpasswd')"
+Menu="Buttons:1"
+Title="Logout"
+Icon="sign-out"
+---
+<?PHP
+/* Copyright 2005-2017, Lime Technology
+ * Copyright 2012-2017, Bergware International.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ */
+?>
+<script>
+function LogoutButton() {
+  $.ajax({
+    type: "GET",
+    url: "/logout.htm",
+    username: "logout",
+    password: "",
+    success: function (data){
+      $('body').html(data);
+    }
+  });
+}
+</script>