allow 'all' for :domain option in addition to :all
Don't remove mailer layouts files
Remove custom errors page section from the guides

This pattern is too problematic and introduces a lot of edge cases:

  * On 4.2, the issue https://github.com/rails/rails/issues/15124 is
    back again.
  * needs to define each action for each http status otherwise the
    router raises ActionController::RoutingError (No route matches).
  * If the router has `match "/*username",...` and some action is
    missing, Rails will pick up the "match" and try to do its job.
  * encourages people to copy & paste programming. Not DRY.

[ci skip]
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.
Hide potentially sensitive ActiveJob params from logs

* Show GlobalID instead of full object .inspect output
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.
Merge pull request #17830 from claudiob/bump-required-ruby-version

Bump required Ruby version to 2.1.0
Merge pull request #17816 from byroot/prevent-numeric-to-s-to-allocate-an-array

Prevent Numeric#to_s from allocating an array
adds missing period in test.rb [ci skip]
Pass symbol as an argument instead of a block
Merge pull request #16833 from sferik/symbol_to_proc

Pass symbol as an argument instead of a block
Pure rack apps can be mounted with a name

See https://github.com/rails/rails/commit/9b15828b5c347395b42066a588c88e5eb4e72279#commitcomment-8764492