Upgrade to Rails 2.0.2

Upgraded to Rails 2.0.2, except that we maintain

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

from Rail 1.2.6 (at least for now), so that Routes don't change. We still
get to enjoy Rails's many new features.

Also fixed a bug in Chunk-handling: disable WikiWord processing in tags (for real this time).

vendor/plugins/action_cache/lib/action_cache.rb

@@ -150,7 +150,7 @@ module ActionController
         def send_not_modified(controller)
           controller.logger.info "Send Not Modified"
           controller.response.headers['ETag'] = %{"#{MD5.new(fragment_body(controller)).to_s}"}
-          controller.render(:text => "", :status => 304)
+          controller.send(:render, {:text => "", :status => 304})
         end
         
         def client_has_latest?(cache_entry, controller)