Fixed issue 4, with fine control over the tabs access.

For each tab, at the exception of the project home and the
administration area, it possible to control the access rights if the
user is anonymous, signed in, member or owner.

src/IDF/conf/idf.php-dist

@@ -103,8 +103,8 @@ $cfg['db_database'] = 'website';
 $cfg['installed_apps'] = array('Pluf', 'IDF');
 $cfg['pluf_use_rowpermission'] = true;
 $cfg['middleware_classes'] = array(
-         'IDF_Middleware',
          'Pluf_Middleware_Session',
+         'IDF_Middleware',
          'Pluf_Middleware_Translation',
          );
 $cfg['template_context_processors'] = array('IDF_Middleware_ContextPreProcessor');