Comment 15 for bug 451336

This is ready for Ubuntu One, Launchpad and other trusted (known RPConfig) consumers to adopt. It just requires them to append the new return_to argument to the SSO logout redirect. I've tested this:

https://login.ubuntu.com/+logout?return_to=https://one.ubuntu.com/dashboard/

And it provides a link back to the U1 dashboard, logging me in again when I click it. A few notes:

 * The return link needs to be bigger and singled out on the page.
 * Return URLs where they match the trust root don't work (eg: ...?return_to=https://one.ubuntu.com/).

We should have fixes for both of these deployed in the next month.