Merge branch 'master' of github.com:Pylons/pyramid
- ``pyramid.testing.DummyResource`` didn't define ``__bool__``, so code under
   Python 3 would use ``__len__`` to find truthiness; this usually caused an
   instance of DummyResource to be "falsy" instead of "truthy".  See
   https://github.com/Pylons/pyramid/pull/1032

Closes #1032