- Passing an ``environ`` dictionary to the ``__call__`` method of a
  "traverser" (e.g. an object that implements
  ``pyramid.interfaces.ITraverser`` such as an instance of
  ``pyramid.traversal.ResourceTreeTraverser``) as its ``request`` argument
  now causes a deprecation warning to be emitted.  Consumer code should pass a
  ``request`` object instead.  The fact that passing an environ dict is
  permitted has been documentation-deprecated since ``repoze.bfg`` 1.1, and
  this capability will be removed entirely in a future version.

- The following (undocumented, dictionary-like) methods of the
  ``pyramid.request.Request`` object have been deprecated: ``__contains__``,
  ``__delitem__``, ``__getitem__``, ``__iter__``, ``__setitem__``, ``get``,
  ``has_key``, ``items``, ``iteritems``, ``itervalues``, ``keys``, ``pop``,
  ``popitem``, ``setdefault``, ``update``, and ``values``.  Usage of any of
  these methods will cause a deprecation warning to be emitted.  These
  methods were added for internal compatibility in ``repoze.bfg`` 1.1 (code
  that currently expects a request object expected an environ object in BFG
  1.0 and before).  In a future version, these methods will be removed
  entirely.