Added a system setting for allowing OpenID logins and registrations

* Defaults to off
* Is set in the Administration panel under Authentication

  #699

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2449 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/users/_form.rhtml

@@ -7,7 +7,9 @@
 <p><%= f.text_field :lastname, :required => true %></p>
 <p><%= f.text_field :mail, :required => true %></p>
 <p><%= f.select :language, lang_options_for_select %></p>
+<% if Setting.openid? %>
 <p><%= f.text_field :identity_url  %></p>
+<% end %>
 
 <% @user.custom_field_values.each do |value| %>
 	<p><%= custom_field_tag_with_label :user, value %></p>