Added automatic case lowering of the login.

This is just a little usability improvement based on user feedback.

src/IDF/Views.php

@@ -59,6 +59,7 @@ class IDF_Views
             return new Pluf_HTTP_Response_Redirect($url);
         }
         $v = new Pluf_Views();
+        $request->POST['login'] = (isset($request->POST['login'])) ? mb_strtolower($request->POST['login']) : '';
         return $v->login($request, $match, Pluf::f('login_success_url'),
                          array(), 'idf/login_form.html');
     }