flexibility on getAuthorizationUrl and Twig extension

I think It is nice to have more flexibility on getAuthorizationUrl method of Security\OAuthUtils. Then I was able to use this method on the twig extension I added. The advantage of that extension is that you can define the callback url you would like to use and you can make use of the extra parameters.

We needed this functionality in our portal but we had to roll our own twig extension, it would be great if we have this feature built in.