allow 'all' for :domain option in addition to :all
Don't remove mailer layouts files
Refactor `add_column_options!`, to move the quoting of default value for :uuid in `quote_value`.
Rename to `quote_default_expression` from `quote_value`
Start Rails 5 development :tada:

We will support only Ruby >= 2.1.

But right now we don't accept pull requests with syntax changes to drop
support to Ruby 1.9.
We don't need to use sass-rails 5.0.0.beta
Use jquery-rails master to resolve dependencies

delayed_job_active_record doesn't allow Rails 5 yet
Merge pull request #17799 from kamipo/refactor_add_column_options

Refactor `add_column_options!`, to move the quoting of default value for :uuid in `quote_value`.
fixed indent of end in jdom.rb
Merge pull request #17818 from bigtone1284/edits_refactor_cop

fixed indent of end in jdom.rb
Prevent Numeric#to_s from allocating an array
Allow failures with Active Job
Allow failures with Active Job integration tests
Fix Sidekiq ActiveJob integration setup

* .connect on a Redis connection wasn't valid
* Reset logger after we're done testing for redis connection to avoid
  "closed stream" error when starting server for real from a fork
make OR in journey patterns compile to a valid regular expression
[ci skip] fix class name
Merge pull request #17828 from yui-knk/fix/i18n_guide

[ci skip] fix class name
Remove a reference to Ruby 1.9 in Guides

[ci skip]

Now that Rails requires Ruby >= 2.0 there is no need to document
Ruby 1.9.
Merge pull request #17838 from claudiob/remove-ruby19-reference-in-guides

Remove a reference to Ruby 1.9 in Guides
Bump required Ruby version to 2.1.0

[This article](http://weblog.rubyonrails.org/2014/8/20/Rails-4-2-beta1/#maintenance-consequences-and-rails-5-0) states that:

> Rails 5.0 is in most likelihood going to target Ruby 2.2.

Before the exact minimum version is fully decided, @arthurnn [suggests](https://github.com/rails/rails/pull/17830#issuecomment-64940383)
that **at least** version 2.1.0 **must** be required by the `gemspec` files.