fix pytest conf

pytest.ini

 [pytest]
+minversion = 2.8
 testpaths = tracim
-python_files = *.py
+addopts = -s -v

tracim/tests/library/test_content_api.py

 from tracim.models.data import Content
 from tracim.models.data import ContentType
 from tracim.models.data import UserRoleInWorkspace
-from tracim.fixtures.users_and_groups import Test as TestFixture
+from tracim.fixtures.users_and_groups import Test as FixtureTest
 from tracim.tests import DefaultTest
 
 
 
 
 class TestContentApiSecurity(DefaultTest):
-    fixtures = [TestFixture, ]
+    fixtures = [FixtureTest, ]
 
     def test_unit__cant_get_non_access_content__ok__nominal_case(self):
         admin = self.session.query(User)\