Use stdlib doctest instead of zope.testing.doctest

hexagonit/recipe/cmmi/tests.py

-from zope.testing import doctest
 from zope.testing import renormalizing
 
+import doctest
 import errno
 import os
 import re

setup.py

@@ -40,6 +40,9 @@ setup(name=name,
       include_package_data=True,
       zip_safe=False,
       install_requires = ['zc.buildout', 'setuptools', 'hexagonit.recipe.download'],
+      extras_require={
+        'test' : ['zope.testing'],
+      },
       tests_require = ['zope.testing'],
       test_suite = '%s.tests.test_suite' % name,
       entry_points = { 'zc.buildout' : ['default = %s:Recipe' % name] },