- Make ZCML filename argument optional to ``make_app``.  Document
  configuration without ZCML.

- Replace martian with something simpler.

- Make sure repoze.bfg.scripting.get_root makes a request with a valid
  registry arg.

- Get rid of ``declarative`` method of Configurator.

- Allow policies, settings, and a root factory to be passed to
  Configurator constructor.