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

lang/en.yml

@@ -147,6 +147,7 @@ field_mail_notification: Email notifications
 field_admin: Administrator
 field_last_login_on: Last connection
 field_language: Language
+field_identity_url: OpenID URL
 field_effective_date: Date
 field_password: Password
 field_new_password: New password
@@ -332,6 +333,7 @@ label_information: Information
 label_information_plural: Information
 label_please_login: Please log in
 label_register: Register
+label_login_with_open_id_option: or login with OpenID
 label_password_lost: Lost password
 label_home: Home
 label_my_page: My page