Do not skip tests when testfixtures is missing (SmileyChris#639)

TESTING.rst

@@ -14,5 +14,5 @@ pytest
 ------
 
 Assuming you're just wanting to test the current development version against
-your virtualenv setup, you can alternatively just ``pip install pytest-django``
-and run ``pytest``.
+your virtualenv setup, you can alternatively just ``pip install pytest-django testfixtures``
+and run ``pytest``.

easy_thumbnails/tests/test_files.py

@@ -7,10 +7,7 @@
 from easy_thumbnails.options import ThumbnailOptions
 from easy_thumbnails.tests import utils as test
 from PIL import Image
-try:
-    from testfixtures import LogCapture
-except ImportError:
-    LogCapture = None
+from testfixtures import LogCapture
 import unittest