__after__ isn't called during redirects (HTTPExceptions raised)

[novalis]

Paste needs a redirect_to class method for request. This will be useful for Pylons, because unlike the Pylons redirect_to, it doesn't operate via exceptions. This is good if you want your after method to be called after a redirect.

Pylons should wrap WSGIRequest to allow it accept url_for style arguments. This can't be in paste because paste doesn't know about routes.

Attached are patches which implement these.

[pjenvey]

I think a better way to fix after during redirects and the like would be to catch HTTPExceptions, call after, then re-raise

[pjenvey]

(In [1477]) ensuring after is called after actions raise HTTPExceptions (e.g. redirect_to). after won't be called (nor will the action, obviously) in the rare case before triggers an HTTPException fixes #127 (thanks David Turner)

[novalis]

I actually think the new Response.redirect_to is useful on its own, because it allows the response to be manipulated (for instance, to set a header).