This is a notable change since this will cause confusing test failures for tests relying on the old naming scheme.

Since Rails 5.0 is switching the Rails command line from 'rake …'
to 'rails …', it makes sense to also replace the `rake` method in
the Rails templates API.

Based on feedback from @matthewd and @kaspth, I chose to replace
`rake` with `rails_command`, which is less confusing than
the alternatives `rails` or `command` or `rails_run` and is not
Thor-reserved word like `task`.

Since a0343d11, `debug_exception_response_format` config depends on `api_only`.
Therefore, if set the `api_only`, need to specify `debug_exception_response_format` is not.

All gems are released now so we don't need to ask the github repository
for these gems anymore.

[ci skip] Adding `on_weekend?` method in edge rails guides

Whenever you are sending emails in integration tests using the `:test`
delivery method you need to make sure that
`ActionMailer::Base.deliveries` is reset after every test. This piece of
boilerplate code is present in all my applications that send
emails. Let's have `ActionDispatch::IntegrationTest` reset the
deliveries automatically.

For more information about GNU zip mime type please check IETF's web site [RFC6713](http://tools.ietf.org/html/rfc6713) or [IANA](http://www.iana.org/assignments/media-types/media-types.xhtml#application)

s/config\/production/config\/environments\/production/

[ci skip]

- Fixed related documentation and usage all around

Fixes #23561

[ci skip]

The iterative process one has to follow is not currently documented, and
people could be unfamiliar with the Rails versioning scheme, causing
them to skip versions or upgrade to patch releases.

[ci skip]

Added important distinction between scopes and class methods.

Fixed errors in rails migrations docs [ci skip]

Fixed errors in rails security docs [ci skip]

- Remove ActionController `logger` and `initialize_framework_caches`
  which were merged into `set_configs` in fbc9d0f4
- Rename ActiveRecord `set_reloader_hooks` changed in 283a0876
- Add missing initializers for ActionController and ActiveRecord

`:nothing` option was deprecated in 44781b6e

Replace `a` with `an`

for rails/rails#23431

       modified:   guides/source/asset_pipeline.md
* description of asset combination from apps and gems, e.g. jquery-rails
* after @vipulnsward's related change rails/rails#23479
  correction: --skip-sprockets will prevent all of these gems, not just sass-rails and uglifier

       modified:   guides/source/working_with_javascript_in_rails.md
* noted that rails.js requires the asset pipeline

[ci skip]

Fixes #23322
[ci skip]