update documentation and code to use _action callbacks
Merge pull request #8454 from frodsan/deprecate_as_basic_object

Rename ActiveSupport::BasicObject to ActiveSupport::ProxyObject
Merge pull request #8455 from frodsan/actionize

Actionize: Use `_action` callbacks in documentation and code
use `_action` instead of `_filter` callbacks
add tests to aliased _filter callbacks
Merge pull request #8456 from frodsan/actionize2

Actionize2
Punctuation, capitalization, grammar fixes in rails guides
use :only instead of :except callback option in the controller template

As [Security Guide](http://edgeguides.rubyonrails.org/security.html#whitelists-versus-blacklists)
says, it's better to use `before_filter only: []` instead of `except: []`
so we don't forget to turn the filter off for newly added actions.
Update activesupport/lib/active_support/deprecation/proxy_wrappers.rb

Fix a typo in rdoc (*expect* for *except*)
fix scaffold controller generator tests
update guides to use _action callbacks [ci skip]
Remove references to Rails versions.

There's no reason for guides to reference old behaviors. They should
be current as of the versions of Rails that they ship with, and including
older information just clutters thing.

I discussed this change with @fxn and he agrees.
Remove reference to background queue in mailer guide.

Mailers are always async now, and we already discuss
queueing lower down in the guide.
Fill out Active Support Core Extensions 'you will learn' list.
Fill out API Documentation Guidelines 'you will learn' list.
Merge pull request #8459 from frodsan/explicit!

use :only instead of :except callback option in the controller template
Merge pull request #8462 from frodsan/update_guides_action_callbacks

Update guides to use _action callbacks [ci skip]
Update AR Changelog with correct example using includes

These queries don't seem to work without the includes clause. [ci skip]
Merge pull request #8457 from caike/master

Update AR Changelog with correct example using includes [ci skip]
Merge pull request #8395 from bmaland/attr_accessors

Use attr_accessor for Rails.{application,cache,logger}