``config.add_request_method`` are now available to tweens.
- Request properties and methods added via ``config.set_request_property`` or
``config.add_request_method`` are now available in the request object
returned from ``pyramid.paster.bootstrap``.
Related partially to issue #520 and issue #538 and issue #596, although it doesn't actually allow us to close any of them, because we still don't issue a newrequest event when bootstrap is used.