Related: #19617, #19187, #19533, #19689, #19675.

'drb/unix' does not exist on mingw.

Related: #19617, #19187, #19533, #19689, #19675.

This is POC (Proof Of Concept) which bundler does not remove mingw lines.
https://github.com/rails/rails/pull/19617#issuecomment-90293795

Add Active Job to Configuring Guide [ci skip]

Fix fails to force_ssl_redirection if session_store is disabled

bugfix CodeStatics#calculate_directory_statics when dir has source ext

see: http://www.openwall.com/lists/oss-security/2015/04/07/11

A shorter and more concise version of select..size

They may be fixed at #19470

fix for actionview parent layout bug

avoid error when sort mixture keys in symbol and string

Allow AS::Cache::FileStore#clear without cache directory

fix documentation for SchemaStatements#add_foreign_key

The implementation of the generation of the foreign key name was changed
between Rails 4.2.0 and 4.2.1 from a random to a deterministic behavior,
however the documentation still describes the old randomized behavior.

Batch touch parent records

[fixes #18606]

Make belongs_to use touch over touch_later when running the callbacks.

Add more tests and small method rename

Thanks Jeremy for the feedback.

Currently `Rails.cache.clear` raises Errno::ENOENT if it's run just
after cloning a new Rails project. It should succeed without removing
files or directories.

it is avoid sort errot within different and mixed keys.
used `sort_by` + `block` to list parameter by keys.
keep minimum changes

This commit fixes issue #19626
Don't need to check layout conditions if there is no condition

test for parent layout bug fix

This make the config/initializers run before the railties are loaded
what can break some configurations.

added docs for ActionDispatch::Request::Session#create

Change join model name constant to private constant

Add charset and collation options support for MySQL string and text columns.

This will resolve the fixme message which is about making constant invisible.

Accept lambda as child_index option in #fields_for method

Fix a regression introduced by removing unnecessary db call when replacing

Raise ArgumentError if an unrecognised callback is skipped

Fix AS::Callbacks raising an error when `:run` callback is defined.

It behaves in the same way that the abstract adapter.

[ci skip]

Fix URL rails-framework-hooks

correct the directory which rake notes look by default [ci skip]

correct spell of exist [ci skip]