Obviated by rubygems/rubygems@486ed83cc8e706069213c5d406122f4cfcca9e7f

This reverts commit bb8923de.

RG2 packager expects each spec.files path to be a file and bombs when it tries to tarball a dir.

May revert if rubygems/rubygems#413 is accepted.

As issue #7978, the order in which ActionMailer
sends multipart messages could be unintentionally
overwritten if a block is passed to the mail
method. This changes the mail method such that
:parts_order is always respected, regardless of
whether a block is passed to mail.

Organized the gemspec files a bit.

 * Made quotes more consistent (single quotes dominated, so I used
   that).
 * Moved license line down a line, separating it logically, and removed
   the extra whitespace before its = operator.
 * Minor whitespace fixes.

This reverts commit 7e0cf563.

Conflicts:
	actionmailer/CHANGELOG.md

See discussion at
https://github.com/rails/rails/commit/7e0cf563639bc7508da381b1b8321c7a89be1aa8#commitcomment-2075489

Revert "Add changelog/release note entries for missing ActionMailer super feature related to inclusion of callbacks in mailers"

This reverts commit f16ec8c8.

Add changelog/release note entries for missing ActionMailer super feature related to inclusion of callbacks in mailers

Change the default test locations to avoid confusion around the common
testing terms "unit" and "functional".
Add new rake tasks for the new locations, while maintaining backwards
compatibility with the old rake tasks.

New testing locations are as follows:

    app/models -> test/models (was test/units)
    app/helpers -> test/helpers (was test/units/helpers)
    app/controllers -> test/controllers (was test/functional)
    app/mailers -> test/mailers (was test/functional)

This makes it easy to write e.g. `Mailer.expects(:deliver_foo)` when
testing code that calls the mailer.

Improve how mailer tests to resolve mailers from the test name.
Add tests for mailer tests using the minitest spec DSL.

This reverts commit f5654e78.

Conflicts:
	actionmailer/lib/action_mailer/base.rb

Reason: @frodsan asked me to revert since this change is breaking the
documentation in the edge API site

Use synchronous queue by default. Separate queued message delivery jobs from the queued message wrappers so the queue itself needn't be marshaled (due to queue reference QueuedMessage).

This allow the users to do:

    config.action_mailer.queue = MyQueue.new

and

    class UsersMailer < ActionMailer::Base
      self.queue = MyQueue.new
    end