Fix PEP8, and forgotten import change. Update .travis.

.travis.yml

@@ -8,3 +8,4 @@ install:
 script:
   - coverage run ./manage.py test tests && coverage report -m
   - pep8 --max-line-length=150 --exclude="urls.py," --statistics openslides
+  - pep8 --max-line-length=150 --statistics tests

tests/agenda/tests.py

@@ -95,7 +95,6 @@ class ItemTest(TestCase):
         self.assertEqual(self.item5.print_related_type(), 'Releateditem')
 
 
-
 class ViewTest(TestCase):
     def setUp(self):
         self.item1 = Item.objects.create(title='item1')

tests/test_init.py

@@ -7,9 +7,9 @@
     :license: GNU GPL, see LICENSE for more details.
 """
 
-from django.test import TestCase
-
 from openslides import get_version, get_git_commit_id
+from openslides.utils.test import TestCase
+
 
 class InitTest(TestCase):
     def test_get_version(self):