EZP-23437: rewrite rules update for nginx

Stored images (var/(dir/)images(-versioned) are now sent to Symfony's
front controller instead of legacy's index_cluster.php

EZP-23437: removed textoimage from dfs rewrite rules

[fixmeup]
Merge pull request #194 from ezsystems/EZP-23437-dfs_io_handler

EZP-23437: rewrite rules update for nginx