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

The error page shown when the method you are requesting on a controller
doesn't specify which controller the method is missing from
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Clean up the config object in ActionPack. Create config_accessor which just delegates to the config object, reducing the number of deprecations and add specific tests.

controller_path is required by ActionView, so move it up to AbstractController and refactor AbstractController::Layouts.

Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

AC::Head now doesn't have an unfulfilled Rendering dependency, and instead works just fine standalone (which means that ConditionalGet also doesn't have a Rendering dependency)

  * This initial implementation is a bit hackish, but it uses a normal middleware API
    so it's future-proof when we improve the internals.