Do not ignore files starting with _ in nose

By default, files starting with _ and setup.py are ignored by nose. This
causes doctests to be skipped in _*.py modules.

Author: lesteve

setup.cfg

@@ -19,6 +19,7 @@ with-doctest = 1
 doctest-tests = 1
 doctest-extension = rst
 doctest-fixtures = _fixture
+ignore-files=^setup\.py$
 #doctest-options = +ELLIPSIS,+NORMALIZE_WHITESPACE
 
 [wheelhouse_uploader]