Fix issue with routes starting by a parameter.

Example :
```
Atomik::set(array(
    'app' => array(
        'routes' => array(
            ':year/archives' => array('action' => 'archives/index')
        )
    )
);
```

For `http://domain.tld/2014/archives` uri, action will be `2014/archives` instead of `archives/index`, as the `:year` parameter is not caught.