Change redirect param name to break loop

[mickaelclavreul]

Fix for #34

[danmarsden]

Thanks @mickaelclavreul - we actually need to add the "loginredirect" to the url rather than replace the "noredirect" one - there are various plugins in the wild that rely on the "noredirect" param - if you get a chance to update your patch so that it adds the extra param I'd be happy to merge this in, otherwise it might sit here for a while until someone gets a chance to add that in.