Instiki 0.16.5

Update to Rails 2.3.2 (the stable Rails 2.3 release).
Add audio/speex support
Update CHANGELOG
Bump version number

vendor/rails/actionpack/lib/action_controller/request.rb

@@ -442,6 +442,7 @@ EOM
     end
 
     def reset_session
+      @env['rack.session.options'].delete(:id)
       @env['rack.session'] = {}
     end