Added the ability to login via OpenID. * Refactored AccountController#login to use either password or openid based authentication * Extracted AccountController#successful_authentication to setup a user's session cookies and redirect * Implemented the start of AccountController#open_id_authentication which will check with the OpenID server and perform authentication. * Added text field for the OpenID url to /login * Added identity_url for OpenID to the user forms. * Added option to login with OpenID to the register form. * Added a root url route, which is used by the OpenID plugin #699 git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2442 e93f8b46-1217-0410-a6f0-8f06a7374b81