- Allow views to be *optionally* defined as callables that accept only

  a request object, instead of both a context and a request (which
  still works, and always will).  The following types work as views in
  this style:

  - functions that accept a single argument ``request``, e.g.::

      def aview(request):
          pass

  - new and old-style classes that have an ``__init__`` method that
    accepts ``self, request``, e.g.::

      def View(object):
          __init__(self, request):
             pass

  - Arbitrary callables that have a ``__call__`` method that accepts
    ``self, request``, e.g.::

      def AView(object):
          def __call__(self, request):
             pass
      view = AView()

  This likely should have been the calling convention all along, as
  the request has ``context`` as an attribute already, and with views
  called as a result of URL dispatch, having the context in the
  arguments is not very useful.  C'est la vie.

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