Implemented EZP-20841: Provide a router script to use with PHP 5.4 built-in server

This pull-request adds a router script to be used along with PHP 5.4 built-in server, **for development purpose only**.
With it, developers can easily start developing with eZ Publish without the need to configure Apache or any other webserver. Specific rewrite rules are taken into account by the router script.

## Usage
```bash
php ezpublish/console server:run -r ../ezrouter.php localhost:8000
```

`../ezrouter.php` is needed because with `server:run` command, working directory is `web/`.