Fix buildout that broke due to version conflicts caused by the latest p.a.contenttypes release.

buildout.cfg

@@ -24,4 +24,9 @@ flake8-max-complexity = 50
 plone.app.discussion =
 zope.interface = 4.0.5
 plone.app.portlets = 2.5a1
+plone.dexterity = 2.2.1
+plone.app.querystring = 1.1.0
+plone.app.jquery = 1.8.3
+plone.app.testing = 4.2.4
+plone.app.vocabularies = 2.1.14
 

setup.py

@@ -51,7 +51,7 @@ setup(name='plone.app.discussion',
       extras_require={
           'test': [
               'plone.app.testing',
-              'plone.app.contenttypes',
+              'plone.app.contenttypes[test]',
           ]
       },
       entry_points="""