import unittest if cannot found unittest2

tests/test_contents.py

@@ -1,5 +1,8 @@
 from __future__ import with_statement
-from unittest2 import TestCase
+try:
+    from unittest2 import TestCase
+except ImportError, e:
+    from unittest import TestCase
 
 from pelican.contents import Page
 from pelican.settings import _DEFAULT_CONFIG

tests/test_readers.py

@@ -1,5 +1,9 @@
 # coding: utf-8
-import unittest2
+try:
+    import unittest2
+except ImportError, e:
+    import unittest as unittest2
+
 import os
 import datetime
 from pelican import readers

tests/test_settings.py

@@ -1,4 +1,8 @@
-import unittest2
+try:
+    import unittest2
+except ImportError, e:
+    import unittest as unittest2
+
 from os.path import dirname, abspath, join
 
 from pelican.settings import read_settings, _DEFAULT_CONFIG