Updated to work with Subversion Edge

The root URL parameter which was previously used in this plugin isn't working with the ViewVC which is bundled with Subversion Edge. As far as I have understood the ViewVC documentation, 'default_root' could be used instead of the URL parameters. In Subversion Edge, this parameter is configured to 'svn' and 'root_as_url_component' is set to 1.

Could you please test if this change is working properly with the ViewVC version of your Subversion installation? Or do you have an alternative idea how we could implement the plugin without the need of a ViewVC configuration change?