Move that part to AV railtie

These constants were removed in 4b97ce5e,
but I forgot to remove the autoload calls ✨.

Method invalid_asset_host! was delegated to controller but sprockets
compile assets in their own scope without controller. And if we set asset_host
with second parameter it should raise error through invalid_asset_host!.
But since controller is nil it cannot be reached.

ActionDispatch::Routing::UrlFor was always required in UrlHelpers. This
was changed by splitting previous implementation of UrlHelper into 2
modules: ActionView::Helpers::UrlHelper and
ActionView::Routing::UrlHelper. The former one keeps only basic
implementation of url_for. The latter adds features that allow to use
routes and is only required when url_helpers or mounted_helpers are
required.

This is another step in moving Action View's dependencies in Action Pack
to Action View itself. Also, HtmlScanner seems to be better suited for
views rather than controllers.

Since it's more about DOM classes and ids it belongs to Action View
better. What's more, it's more convenient to make it part of Action View
to follow the rule that Action Pack can depend on Action View, but not
the other way round.

Since Action View should not depend on actionpack, it's best to delegate
invalid_asset_host! to controller and just rely on such simple contract
instead of raising ActionController::RoutingError directly.

The new option allows any Ruby namespace to be registered and set
up for eager load. We are effectively exposing the structure existing
in Rails since v3.0 for all developers in order to make their applications
thread-safe and CoW friendly.

This is a private place to put those AS features that are used
by every component. Nowadays we cherry-pick individual files
wherever they are used, but that it is not worth the effort
for stuff that is going to be loaded for sure sooner or later,
like blank?, autoload, concern, etc.

More info http://edgeguides.rubyonrails.org/api_app.html

[Carlos Antonio da Silva & Santiago Pastorino]

Also, no need to include dependencies in AS::Concerns inside included blocks.

This will allow us to do a rootless JSON/XML request to server.

Added stream as class level method to make it explicit when to stream.
Render also accepts :stream as option.

This would become useful for site which sometime transferring sensitive information such as account information on particular controller or action.

This featured was requested by DHH.

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

This brings back the deprecated modules from ActionController, because
they didn't have any deprecation warning.

This removes all deprecated classes in ActionController related to
Routing, Abstract Request/Response and Integration/IntegrationTest.
All tests and docs were changed to ActionDispatch instead of ActionController.

Booting a new Rails application does not work after this commit [#5359 state:open]

This reverts commit 38a421b3.

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

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