* It is not possible to always pre-determine the layout before going to ActionView.
    This was *already* broken for render :partial => @object, :layout => true. This is
    now handled by overriding render_to_body in layouts.rb and manually injecting the
    partial's response. This needs to be done in ActionController since ActionController
    knows enough to get _layout_for_option. There is probably a better abstraction here.
  * As a result, all partial rendering can correctly restrict their layouts to the mime
    type of the rendered partial. This could have previously caused a bug in some edge cases.
  * If other layout-like options are added, they might need to add special code for the
    case of render :partial. We should try to think of an alternate solution, if possible,
    but this works for the cases we know of now.

Move the exceptions for missing template into Compatibility in prep for moving it into a "not-production" module

Break up DependencyModule's dual function of providing a "depend_on" DSL and "included" block DSL into separate modules. But, unify both approaches under AS::Concern.

This reverts commit 0cac68d3.

Get controller/render_other_test.rb to pass on new base and fixed a bug in new base with regards to rendering layouts.

Get controller/layout_test.rb running on new base except for ActionController::Base.exempt_from_layout which is going to be deprecated.

Cleaned up the #render_to_body chain by extracting determining the templates to render to a separate hook point.

This reverts commit a747ab5b.

  * Decouple from ActionController and ActionMailer
  * Bring back localization support.
  * Prepare to decouple templates from the filesystem.
  * Prepare to decouple localization from ActionView
  * Fix ActionMailer to take advantage of ActionView::Path

In the middle of some refactoring... some fails due to changes in AbstractController not yet reflected in ActionController tests

* Required small architecture change