- move the try/except dance in support.py

- use relative . imports in test files
- remove the "future with import", since python < 2.6 is not supported

tests/support.py

@@ -1,9 +1,20 @@
+__all__ = [
+    'temporary_folder',
+    'get_article',
+    'unittest',
+]
+
 from contextlib import contextmanager
 from tempfile import mkdtemp
 from shutil import rmtree
 
 from pelican.contents import Article
 
+try:
+    import unittest2 as unittest
+except ImportError:
+    import unittest
+
 
 @contextmanager
 def temporary_folder():