Feature/active job test helper

Fix inherit from deprecated `ActionView::Template::Handlers::Erubis`

Get neglected TODO done in render_test

Freeze default empty string for sql_type in get_oid_type

There are some classes inherit from `ActionView::Template::Handlers::Erubis`.
(ex. https://github.com/haml/haml/blob/4.0.7/lib/haml/helpers/safe_erubis_template.rb#L3)

```
Class.new(ActionView::Template::Handlers::Erubis)
# => TypeError: superclass must be a Class (ActiveSupport::Deprecation::DeprecatedConstantProxy given)
```

Fix typo about sort in finder_methods.rb

Add test for `variable_size_secure_compare`

Remove redundant right parentheses in number_helper [ci skip]

Refactored ActiveJob TestAdapter

Updated ActiveJob changelog

Fixed typo in changelog

Fixed formatting issue in changelog

Reload `through_record` that has been destroyed in `create_through_record`

Raise an error if FileUpdateChecker#execute is called with no block

The raw_source method is documented as returning the exact value that
was used to create the body; mutating it breaks that contract.

Additionally, if the value used to create the body is blank, raw_source
returns a frozen string which causes the interceptor to raise an error.

Specify complete path to AR::LegacyYamlAdapter

add default value to `deliver_later_queue_name` option [ci skip]

Remove unused argument `formats`

Added warning for reserved YAML keywords.

Fully initialize routes before the first request is handled

correctly check error message

Lambda scopes require a bunch more work.  Ideally the `scope` list would
be a homogeneous collection.  In this case, the reflection knows how to
construct the right reflection for this join, so lets just construct
that relation rather than instance execing to figure it out later.

Update i18n.md

Addressed Feedback

Deprecate `scope_chain`

`PolymorphicReflection` needs to be custom for handling scope lambdas

Each reflection should be responsible for returning the scopes needed to
query against the db.

Update Unicode Version to 9.0.0

Also change the class_methods to ClassMethods since the former document
the method as an instance method of Parameterized not as a class method.

We own the class so we can override the initialize.