Minitest rails upgrade
Crossdomain support

Signo returns username as a parameter in return_url besides storing in
cookie. This enables Signo authentication to work across more domains.
Cookie support is still in place because if you are running Signo and
other apps on same domain it will save you some redirects.
Merge pull request #15 from ares/bug/976460_crossdomain_support

Bug/976460 crossdomain support