Introduced the `$site_root` and `$home_root` parameter in `mod_rewrite_rules`

[sebastian.pisula]

if I want make custom rewrite rule I must use in filter this script:

<?php
$home_root = parse_url(home_url());
                if ( isset( $home_root['path'] ) )
                        $home_root = trailingslashit($home_root['path']);
                else
                        $home_root = '/';

So I think that this is good idea with new params in filter

[sebastian.pisula]

$home_root i more important

[sebastian.pisula]

Refreshed patch