Features

--------

- In previous versions of BFG, the "root factory" (the ``get_root``
  callable passed to ``make_app`` or a function pointed to by the
  ``factory`` attribute of a route) was called with a "bare" WSGI
  environment.  In this version, and going forward, it will be called
  with a ``request`` object.  The request object passed to the factory
  implements dictionary-like methods in such a way that existing root
  factory code which expects to be passed an environ will continue to
  work.

Internal
--------

- The request implements dictionary-like methods that mutate and query
  the WSGI environ.  This is only for the purpose of backwards
  compatibility with root factories which expect an ``environ`` rather
  than a request.

- The ``repoze.bfg.request.create_route_request_factory`` function,
  which returned a request factory was removed in favor of a
  ``repoze.bfg.request.route_request_interface`` function, which
  returns an interface.

- The ``repoze.bfg.request.Request`` class, which is a subclass of
  ``webob.Request`` now defines its own ``__setattr__``,
  ``__getattr__`` and ``__delattr__`` methods, which override the
  default WebOb behavior.  The default WebOb behavior stores
  attributes of the request in ``self.environ['webob.adhoc_attrs']``,
  and retrieves them from that dictionary during a ``__getattr__``.
  This behavior was undesirable for speed and "expectation" reasons.
  Now attributes of the ``request`` are stored in ``request.__dict__``
  (as you otherwise might expect from an object that did not override
  these methods).

- Reverse the order in which the router calls the request factory and
  the root factory.  The request factory is now called first; the
  resulting request is passed to the root factory.

- The ``repoze.bfg.request.request_factory`` function has been
  removed.  Its functionality is no longer required.

- The "routes root factory" that wraps the default root factory when
  there are routes mentioned in the configuration now attaches an
  interface to the request via ``zope.interface.directlyProvides``.
  This replaces logic in the (now-gone)
  ``repoze.bfg.request.request_factory`` function.

- The ``route`` and ``view`` ZCML directives now register an interface
  as a named utility (retrieved from
  ``repoze.bfg.request.route_request_interface``) rather than a
  request factory (the previous return value of the now-missing 
  ``repoze.bfg.request.create_route_request_factory``.

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