Removed most of absolute_import imports

Should be unneeded with Python 2.7 and up.
Added some unicode_literals along the way.

tests/conditional_processing/views.py

@@ -1,6 +1,3 @@
-# -*- coding:utf-8 -*-
-from __future__ import absolute_import
-
 from django.views.decorators.http import condition, etag, last_modified
 from django.http import HttpResponse