This helps bring the interfaces of CollectionProxy and Relation closer
together, and reduces the delegation backflips we need to perform.

For example, first_or_create is defined thus:

class ActiveRecord::Relation
  def first_or_create(...)
    first || create(...)
  end
end

If CollectionProxy < Relation, then post.comments.first_or_create will
hit the association's #create method which will actually add the new record
to the association, just as post.comments.create would.

With the previous delegation, post.comments.first_or_create expands to
post.comments.scoped.first_or_create, where post.comments.scoped has no
knowledge of the association.

Add test Hash#except can receive more than one argument.

In robots.txt User-agent should be all downcase except for the first 'U'

In robots.txt, User-agent should be all downcase except for the first 'U', according with http://en.wikipedia.org/wiki/Robots_exclusion_standard

Plugin generator crashes when using the --dummy-path option

Code was assuming the application name in `config/application.rb`
was module Dummy.

This commit improves the handling of default_url_options in integration
tests by making behave closer to how a real application operates.

Specifically the following issues have been addressed:

* Options specified in routes.rb are used (fixes #546)
* Options specified in controllers are used
* Request parameters are recalled correctly
* Tests can override default_url_options directly

remove duplicate usage of Rack::Utils.status_code in LogSubscriber#process_action

add unless_exist option to memory store

Remove key argument from run_callbacks to fix build

Removing key argument from run_callbacks method in abstract_controller

AS::Callbacks#run_callbacks remove key argument

Rename variables and remove unused code in fixtures.rb

Fixed bug in ActiveRecord that caused classes to be quoted incorrectly

Update tranasaction state when record gets commited 

Rename some parameters and instance and local variables, mostly in fixtures.rb.  Also remove an unused assignment to an instance variable.

There are minor code changes.

Updated activesupport CHANGELOG

called from after_commit callback

Add CHANGELOG section for unreleased Rails 3.2.4; document addition of #beginning_of_hour and #end_of_hour to Time and DateTime core extensions.

Remove the unused private method ActiveRecord::Fixtures#yaml_fixtures_key(path).

Second parameter of Fixtures::instantiate_fixtures was not used, so i removed it.