Change AV formats so they can delegate to the controller. Now users (or plugins) can override details_for_render in their controllers and add appropriate additional details. Now if only they could *do* something with those details...

1.9 seems to have a bug involving cloned classes and super. Fix it by not cloning (and instead creating classes on demand). The 1.9 bug should be investigated.

If IntegrationSession is initialized with an objects that responds to #routes, automatically extend the URL helpers from the RouteSet onto it

Upon further reflection, we realized that SharedTestRoutes is not really a hack, but is instead a standin (in the Rails tests) for Rails.application.routes.

  * In a real application, action_controller/railties.rb does AC::Base.include(app.routes.url_helpers)
  * ActionController itself does not know about Rails.application, but instead can have named routes for any router
  * SharedTestRoutes are created in abstract_unit to stand in for Rails.application.routes, and is used in
    internal functional tests

Including UrlFor in Redirecting and Head will warn usefully if a controller is wired up without a router included (and still support redirect_to "omg")

Remove traces of SharedTestRoutes from user code; leave it as a standin for Rails.application.routes in Rails internal tests

	This attr_accessor can be set in a before filter or in the action itself.
    Overwriting default_url_options still works but will output a deprecation notice.