ActiveSupport core extensions guides update

remove unnecessary object/conversions file

Remove duplicate 'the' article in commented line

The sentence used to read "at the bottom of the the compiled file"

remove unused `expand_range_bind_variables` method

this method was not used, not documented and not tested.

Moving locale stuff from app.rb to an initializer.

Should use app.paths instead of specific path.

Rename "ActiveRecord::Fixtures" to "ActiveRecord::FixtureSet"

Update actionmailer with new hash syntax.

Just to make clear we don't accept this kind of pull request because it can invalidate a lot of pull requests.

I'm accepting this because Action Mailer has only two open pull requests.

Rename `ActiveRecord::Fixtures` class to `ActiveRecord::FixtureSet`.  Instances of this class normally hold a collection of fixtures (records) loaded either from a single YAML file, or from a file and a folder with the same name.  This change make the class name singular and makes the class easier to distinguish from the modules like `ActiveRecord::TestFixtures`, which operates on multiple fixture sets, or `DelegatingFixtures`, `::Fixtures`, etc., and from the class `ActiveRecord::Fixture`, which corresponds to a single fixture.

Fix warning: circular require considered harmful.

Tag the blank log line between dev requests so it's easier to filter out entire requests with grep -v without leaving a stray newline behind. Example:

  # Tag asset requests so it's easy to filter them from dev logs
  config.log_tags = [
    -> request { :assets if request.path.starts_with?(config.assets.prefix) },
    -> request { request.uuid }
  ]

  # Watch the logs, ignoring asset requests
  $ tail -100f log/development.log | grep -v assets

Ruby 2 compat. CGI.escapeHTML has changed the way it escapes apostrophes a few times, so fix up the test to work with however it chooses to escape.

Ruby 2 compat. Hash[] now raises on bad elements rather than ignoring them. No sense over-testing this MRI-specific behavior. See ruby/ruby@8d6add973ebcb3b4c1efbfaf07786550a3e219af

Also the blank? check introduced a bug.

$ rails generate model Foo blank:boolean

form_for(Foo.new(:blank => true)) => ArgumentError, "First argument in form cannot contain nil or be empty"

* Uses the Ruby 1.9 hash syntax
* Avoid escaping " inside string using the %{} syntax

Responsive guides

Accept :remote as symbol in link_to options

Accept either :remote or 'remote' in both the html_options and
(url_)options hash arguments to link_to.