Don't use send when we own the method
No need to gsub the string
No need to use begin/end blocks
Improve CHANGELOG entry
Merge branch 'rm-create-with-index'
Remove unused method

This method is not being called anywhere in our code and a GitHub search
show it is not being used in any project.
Edge Rails applications doesn't need to use arel master
Fix build with bundler 1.6
Add a test case for save(validate:false) with invalid foreign key.

It is supposed to raise ActiveRecord::InvalidForeignKey when the
database has a fk constraint.
Merge pull request #14494 from laurocaetano/test_case_for_fk_with_validate_false

Add a test case for save(validate: false) with invalid foreign key.
only run citext_test if the connection supports_extensions?.

This will keep the test suite passing with older PG installations.
require dependency to execute a single test from xml_serialization_test

When the tests are executed in order, the dependency is loaded at the right time.
However this makes it impossible to execute a single test later down the line.
Let's require the dependecy at the beginning to get them working independent of the order.

This resolves the following error:

```
$ ARCONN=postgresql ruby -Itest /Users/senny/Projects/rails/activerecord/test/cases/xml_serialization_test.rb -n test_to_xml
Using postgresql
Run options: -n test_to_xml --seed 51819

E

Finished in 0.081320s, 12.2971 runs/s, 0.0000 assertions/s.

  1) Error:
DatabaseConnectedXmlSerializationTest#test_to_xml:
NameError: uninitialized constant DatabaseConnectedXmlSerializationTest::REXML
    /Users/senny/Projects/rails/activerecord/test/cases/xml_serialization_test.rb:226:in `test_to_xml'
```

/cc @tgxworld fyi
Clarify environment_name for logs

[ci skip]
ActiveRecord/ActiveModel '#validate' alias for 'valid?'

It's unintuitive to call '#valid?' when you want to run validations but
don't care about the return value.

The alias in ActiveRecord isn't strictly necessary (the ActiveModel
alias is still in effect), but it clarifies.
Merge pull request #14456 from henrik/add-validate-method

ActiveRecord/ActiveModel '#validate' alias for 'valid?'
Add CHANGELOG to Active Model too [ci skip]
AR .persisted? throws SystemStackError for an unsaved model with a
custom primary_key that didn't save due to validation error
Merge pull request #14393 from chrisfinne/persisted_exception

AR .persisted? throws SystemStackError for an unsaved model with a
custom primary_key that didn't save due to validation error
Adds explanation of :base attribute to errors.add

[ci skip]
Merge pull request #14505 from davefp/patch-1

Adds explanation of :base attribute to errors.add [ci skip]