Bug Fixes
---------

- When the ``Configurator`` is passed an instance of
  ``zope.component.registry.Components`` as a ``registry`` constructor
  argument, fix the instance up to have the attributes we expect of an
  instance of ``repoze.bfg.registry.Registry`` when ``setup_registry``
  is called.  This makes it possible to use the global Zope component
  registry as a BFG application registry.

Documentation
-------------

- Change renderings of ZCML directive documentation.

- Add a narrative documentation chapter: "Using the Zope Component
  Architecture in ``repoze.bfg``"