config.action_controller.default_asset_host_protocol

It's best to leave this unset.

When unset the :request protocol is used whenever it can be and
:relative is used in the other situations.

When set to :request then assets hosts will be disabled when there
is no request in scope and will use the request protocol whenever a
request is in scope.

If set to :relative, then a relative protocol is always used except
for stylesheet link tags which must use the :request protocol to
avoid double downloads in IE6&7.

Conflicts:

	actionpack/lib/sprockets/helpers/rails_helper.rb
	actionpack/test/template/sprockets_helper_test.rb

Stylesheet link tags should use the request protocol to avoid duplicate download of stylesheets in IE7 and IE8.

Conflicts:

	actionpack/lib/action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers.rb
	actionpack/lib/sprockets/helpers/rails_helper.rb

Add asset_url helper and refactor the asset paths so that asset hosts can be used during asset precompilation.

Conflicts:

	actionpack/lib/action_view/asset_paths.rb
	actionpack/lib/sprockets/helpers/rails_helper.rb
	actionpack/test/template/sprockets_helper_test.rb

This allows test classes that are not subclasses of
ActiveSupport::TestCase (like those in rspec-rails) to interact with
with this variable without having to reference ActiveSupport::TestCase.

make the logs a little simpler to view, put the render message inline with other events, pull processing to char[0] and add a new line to the completed. looks more like a block now, which is useful for serial actions like test/dev

This reverts commit 458512c8.

reorder layout selection examples to occur in the order that the code does, and provide more detail on why each selection is made

It would raise undefined method controller_name for nil

This fixes an error when a record object that is a subclass of Hash is
passed to fields_for, which is incorrectly interpreted as field options.

Make the API for compression consistent between JS and CSS. By default, users just need to say whether they want compression or not, and a default will be chosen by a Railtie. In the case of CSS, this default is already chosen by the sass-rails gem.

Users can still explicitly choose a compressor in their application.rb if they have a preference, but will usually want to let plugins choose defaults in their Railties.