Changed ActiveRecord::Associations::CollectionProxy#select to take multiple arguments.

This makes the arguments the same as ActiveRecord::QueryMethods::select.
Maintain proleptic gregorian in Time#advance

Time#advance uses Time#to_date and Date#advance to calculate a new date.
The Date object returned by Time#to_date is constructed with the assumption
that the Time object represents a proleptic gregorian date, but it is
configured to observe the default julian calendar reform date (2299161j)
for purposes of calculating month, date and year:

  Time.new(1582, 10, 4).to_date.to_s           # => "1582-09-24"
  Time.new(1582, 10, 4).to_date.gregorian.to_s # => "1582-10-04"

This patch ensures that when the intermediate Date object is advanced
to yield a new Date object, that the Time object for return is contructed
with a proleptic gregorian month, date and year.
Allows you to check if an attribute has changed to a particular value

model.name_changed?(from: "Pete", to: "Ringo")
[ci skip] trailing documentation whitespace
Fix few typos and improve markup at some levels
Add any/all support for variants

Like `format.any`, you can do the same with variants.

It works for both inline:

    respond_to do |format|
      format.html.any   { render text: "any"   }
      format.html.phone { render text: "phone" }
    end

and block syntax:

    respond_to do |format|
      format.html do |variant|
        variant.any(:tablet, :phablet){ render text: "any" }
        variant.phone { render text: "phone" }
      end
    end
used user-defined configurations for running tests that might depend on user's system configuration
Fix method redefined warning message in mapper.rb
Fix Encoding::CompatibilityError when public path is UTF-8

In #5337 we forced the path encoding to ASCII-8BIT to prevent static
file handling from blowing up before an application has had chance to
deal with possibly invalid urls. However this has a negative side
effect of making it an incompatible encoding if the application's
public path has UTF-8 characters in it.

To work around the problem we check to see if the path has a valid
encoding once it has been unescaped. If it is not valid then we can
return early since it will not match any file anyway.

Fixes #13518
raise `ArgumentError` exception if `Model.where.not` is called with `nil` argument
Merge pull request #13534 from kuldeepaggarwal/f-where-not

raise ArgumentError for nil in .where.not
Merge pull request #13527 from kuldeepaggarwal/f-independent-specs

Use user-defined configurations in mysql tests
Extract db url connection logic to class
Merge pull request #13535 from schneems/schneems/extract-url-logic

Extract db url connection logic to class
Revert "Install bundle gems to the system not to vendor/bundle"

This reverts commit 875dd3edfd34eaa20120b6589b0d1905230e948f.

The issue was fixed in rbx-2.2.3
Remove deprecation warning for FIXTURES_PATH

FIXTURES_PATH has a bit different case than DatabaseTasks.fixtures_path,
which was added along with deprecation. A use case for FIXTURES_PATH
could be loading fixtures from a different directory just for a given
test run. The implementation is fairly simple, so leaving it as it is
won't hurt.
Add a missing changelog entry for #13534 [ci skip]
Merge pull request #13538 from robin850/patch-14

Add a missing changelog entry for #13534 [ci skip]
tidy AR CHANGELOG. [ci skip]
Update explanation to match example