Fix non-specified params with default value in url

    Atomik::set('app.routes', array(
        'archive/:year/:month' => array(
            '@name' => 'archives',
            'action' => 'archives/index',
            'month' => 'all'
        )
    );
    echo Atomik::url('@archives', array('year' => 2014)); 

Before fix :

    archives/2014/:month

After fix :

    archives/2014