prepping for 3.0.5 release

RAILS_VERSION

actionmailer/lib/action_mailer/version.rb

actionpack/lib/action_pack/version.rb

activemodel/lib/active_model/version.rb

activerecord/lib/active_record/version.rb

activeresource/lib/active_resource/version.rb

activesupport/lib/active_support/version.rb

railties/lib/rails/version.rb

version.rb