Removes the fat ruby-openid gem. Simply use 'gem install ruby-openid' to enable openid support.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2458 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/setting.rb

@@ -140,6 +140,10 @@ class Setting < ActiveRecord::Base
     per_page_options.split(%r{[\s,]}).collect(&:to_i).select {|n| n > 0}.sort
   end
   
+  def self.openid?
+    Object.const_defined?(:OpenID) && self['openid'].to_s == '1'
+  end
+  
   # Checks if settings have changed since the values were read
   # and clears the cache hash if it's the case
   # Called once per request