Update rails to 2.1.1.

Changes:

* Fix script/about in production mode.  #370 [Cheah Chu Yeow, Xavier
  Noria, David Krmpotic]

* Add the gem load paths before the framework is loaded, so certain
  gems like RedCloth and BlueCloth can be frozen.

* Fix discrepancies with loading rails/init.rb from gems.

* Plugins check for the gem init path (rails/init.rb) before the
  standard plugin init path (init.rb) [Jacek Becela]

* Wrapped Rails.env in StringInquirer so you can do
  Rails.env.development? [DHH]

* Fixed that RailsInfoController wasn't considering all requests local
  in development mode (Edgard Castro) [#310 state:resolved]

(minskim)