Added method `#eql?` to `ActiveSupport::Duration`, in addition to `#==`.

Currently, the following returns `false`, contrary to expectation:

    1.minute.eql?(1.minute)

Adding method `#eql?` will make this behave like expected. Method `#eql?` is
just a bit stricter than `#==`, as it checks whether the argument is also a
uration. Their parts may be different though.

    1.minute.eql?(60.seconds)  # => true
    1.minute.eql?(60)          # => false
SQLite3Adapter now checks for views in table_exists? fixes: 14041
Update RecordNotFound exception cases to include a message with the
Model that the Record was not found in.
Updating Associations::Preloader docs

Much of the previous documentation introduced features new in 2011. This
commit refreshes it to provide clearer code examples and spends more
time describing the normal case (preloaded associations) and less time
describing the fallback.

[ci skip]
Roll back open transactions when the running thread is killed.
Added enable_extension! to helper
Do not mark object as persisted after an association is saved

Callback order in Active Record objects are important. Users should not
define callbacks before the association definition or surprising
behaviours like the described at #3798 will happen. This callback order
dependency is documented at https://github.com/rails/rails/blob/31bfcdc77ca0d8cec9b5fe513bdc6f05814dd4f1/activerecord/lib/active_record/associations.rb#L1222-1227.

This reverts #15728.

Fixes #16620.
Remove CHANGELOG entry [ci skip]
Merge pull request #16114 from seuros/test_clean

[Postgresql tests] Added enable_extension! to helper
Add TODO to release the gems before the next Rails release
Use the released jquery-rails gem
Dependencies: bump to jquery-rails 4.0.0.beta2
fix the undefined method content_tag #15245
not required include ActionView::Helpers::TagHelper in test as well
Deprecate implicit AD::Response splatting and Array conversion
Merge pull request #16822 from jeremy/deprecate-problematic-implicit-response-splatting

Deprecate implicit AD::Response splatting and Array conversion
Merge pull request #16824 from rajcybage/action_view_content_tag

fix the undefined method content_tag #15245
Dynamically modified schema and association would not be correctly reset

This fixes <"SQLite3::SQLException: no such column: legacy_things.person_id: SELECT \"legacy_things\".* FROM \"legacy_things\" WHERE \"legacy_things\".\"person_id\" = ?">
in OptimisticLockingTest#test_lock_destroy
disable migrations logging while running test cases for AR schema tests
Add support for Rack::ContentLength middelware
Fix query with nested array in Active Record

`User.where(id: [[1,2],3])` was equal to `User.where(id:[1, 2, 3])`
in Rails 4.1.x but because of some refactoring in Arel this stopped
working in 4.2.0. This fixes it in Rails.

[Dan Olson & Cristian Bica]