return_url does not support req.baseUrl

[akaNightmare]

Hi, I've a problem, when config is:

{
    login_url: '/test/sso/login',
    consent_url: '/test/sso/consent',
}

and OpenIDConnect generate url /login
I found the solution:
in line
var q = req.parsedParams?req.path+'?'+querystring.stringify(req.parsedParams):req.originalUrl;
should add req.baseUrl + req.path

[lionello]

Fixed by #50