Fix a bug where requires inside of autoloads were being added to the autoloaded_constants list, causing mayhem. [#5165 state:resolved]

Gemfile now makes use of platforms calls with blocks instead of elsif logic to define dependencies over specific platforms

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Add assertion to link_to_function test with block and capture, and more expressive test name [#5179 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

application generation: --skip-testunit and --skip-activerecord renamed to --skip-test-unit and --skip-active-record respectively

Reason is their proper spellings are "Test::Unit" and "Active Record".
Option names and descriptions have been revised, as well as some method
names and minor details here and there.

* AS::Notifications#instrument should not measure anything, it is not its responsibility;

* Adding another argument to AS::Notifications#instrument API needs to be properly discussed;

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Move config_accessor :asset_host from ActionController::Base to AbstractController which fixes issues with asset_host in ActionMailer

Including:
  - Moved mailer objects in separate directory
  - Added two tests for asset_host configuration option