Don't ensure all keys in build_results are only written once, otherwise we get false positive builds reported.

Conflicts:
	activerecord/RUNNING_UNIT_TESTS

This reverts commit 79990505.

Conflicts:

	activerecord/CHANGELOG

Reason: Sorry, CHANGELOGs can't be edited via docrails.

Fix another CIfail ⚡ 🔥 Deleting RAILS_ENV from ENV doesn't produce the desired result if RACK_ENV is still defined. And in any case it's better to be explicit here, so just set RALS_ENV=development.

Fix for CI server. Dependent on RAILS_ENV=development

The guide was contracting itself. First it stated that 'there is a list
of callbacks in order of execution', on the list 'after_save' was placed
before 'after_create', and then there was a warning that 'after_save'
runs after them. I am not sure about 'around_' callbacks, but let's
leave that for another patch.

framework_test.rb also dependent on RAILS_ENV=development

This commit restores the ability to assign cookies for testing via
@request.env['HTTP_COOKIE'] and @request.cookies, e.g:

    @request.env['HTTP_COOKIE'] = 'user_name=david'
    get :index
    assert_equal 'david', cookies[:user_name]

and

    @request.cookies[:user_name] = 'david'
    get :index
    assert_equal 'david', cookies[:user_name]

Assigning via cookies[] is the preferred method and will take precedence
over the other two methods. This is so that cookies set in controller
actions have precedence and are carried over between calls to get, post, etc.

 sprockets gem update to beta9

Test added for namedscope target.

Allow multiple sources in Sprockets helpers