- Add a ``custom_predicates`` argument to the ``Configurator``

  ``add_view`` method, the ``bfg_view`` decorator and the attribute
  list of the ZCML ``view`` directive.  If ``custom_predicates`` is
  specified, it must be a sequence of predicate callables (a predicate
  callable accepts two arguments: ``context`` and ``request`` and
  returns ``True`` or ``False``).  The associated view callable will
  only be invoked if all custom predicates return ``True``.  Use one
  or more custom predicates when no existing predefined predicate is
  useful.  Predefined and custom predicates can be mixed freely.

- Add a ``custom_predicates`` argument to the ``Configurator``
  ``add_route`` and the attribute list of the ZCML ``route``
  directive.  If ``custom_predicates`` is specified, it must be a
  sequence of predicate callables (a predicate callable accepts two
  arguments: ``context`` and ``request`` and returns ``True`` or
  ``False``).  The associated route will match will only be invoked if
  all custom predicates return ``True``, else route matching
  continues.  Use one or more custom predicates when no existing
  predefined predicate is useful.  Predefined and custom predicates
  can be mixed freely.

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