Revert "Added ActiveRecord::Base#last_modified to work with the new fresh_when/stale? conditional get methods from Action Pack"

Needless indirection with no added value.

This reverts commit 535853e8.

Added ActiveRecord::Base#last_modified to work with the new fresh_when/stale? conditional get methods from Action Pack

Log 'Filter chain halted as CALLBACKNAME rendered or redirected' every time a before callback halts.

A test case to ensure that AC::Metal#response_body= always wraps the given value in an Array in both Ruby 1.8 and 1.9 (refs #3581)

    See-also pull request #3561 from 3-1-stable

    Otherwise the following occurs:

    TypeError: can't convert nil into String
        /Users/bfolkens/dev/bfolkens-rails-core/actionpack/lib/action_dispatch/http/url.rb:75:in host_or_subdomain_and_domain'
        /Users/bfolkens/dev/bfolkens-rails-core/actionpack/lib/action_dispatch/http/url.rb:37:in url_for'
        /Users/bfolkens/dev/bfolkens-rails-core/actionpack/lib/action_dispatch/routing/url_for.rb:147:in test_subdomain_may_be_accepted_with_numeric_host'
        /Users/bfolkens/dev/bfolkens-rails-core/activesupport/lib/active_support/testing/setup_and_teardown.rb:67:in run'
        /Users/bfolkens/dev/bfolkens-rails-core/activesupport/lib/active_support/callbacks.rb:426:in send'
        /Users/bfolkens/dev/bfolkens-rails-core/activesupport/lib/active_support/callbacks.rb:81:in run'

Ensure that the format isn't applied twice to the cache key, else it becomes impossible to target with expire_action.

Responders now return 204 No Content for API requests without a response body (as in the new scaffold)

Fix fragment caching (squashed commits)

:subdomain can now be specified with a value of false in url_for, allowing for subdomain(s) removal from the host during link generation. Closes #2025

This reverts commit 0e4748cd.

For example, calling hello.erb is now deprecated. Since Rails 3.0
passing the handler had no effect whatsover. This commit simply
deprecates such cases so we can clean up the code in later releases.

Use lazy load hooks to set parameter wrapping configuration. This means that it doesn't force Action Controller / Active Record to load, but it doesn't fail if they have already loaded. Thanks @josevalim for the hint.

Don't refer to ActionController::Base in the wrap_parameters initializer - use config object instead. Cuts about 15% off the load time. (#734)