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

public/stylesheets/application.css

@@ -69,6 +69,8 @@ html>body #content { min-height: 600px; }
 #login-form table td {padding: 6px;}
 #login-form label {font-weight: bold;}
 
+input#openid_url { background: url(../images/openid-bg.gif) no-repeat; background-color: #fff; background-position: 0 50%; padding-left: 18px; }
+
 .clear:after{ content: "."; display: block; height: 0; clear: both; visibility: hidden; }
 
 /***** Links *****/