removed redundant code in middlware, added tox unit tests

.gitignore

@@ -5,3 +5,4 @@ django_userforeignkey.egg-info/**
 .idea/**
 venv/
 build/
+.tox/

README.rst

@@ -89,3 +89,5 @@ Development and Tests
     cd tests/user_foreign_key_testapp
     python manage.py test
 
+
+You can also use `tox` for testing, as it will test against Django 1.8, 1.9, 1.10 with Python versions 2.7, 3.4 and 3.5. See ``tox.ini`` for details.

django_userforeignkey/middleware.py

@@ -6,20 +6,9 @@
 try:
     from django.utils.deprecation import MiddlewareMixin
 except:
+    # Django 1.8 and 1.9 compatibility
     class MiddlewareMixin(object):
-        def __init__(self, get_response=None):
-            self.get_response = get_response
-            super(MiddlewareMixin, self).__init__()
-
-        def __call__(self, request):
-            response = None
-            if hasattr(self, 'process_request'):
-                response = self.process_request(request)
-            if not response:
-                response = self.get_response(request)
-            if hasattr(self, 'process_response'):
-                response = self.process_response(request, response)
-            return response
+        pass
 
 
 logger = logging.getLogger(__name__)

setup.py

@@ -24,6 +24,7 @@
         'Framework :: Django',
         'Framework :: Django :: 1.8',
         'Framework :: Django :: 1.9',
+        'Framework :: Django :: 1.10',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',

tox.ini

@@ -0,0 +1,19 @@
+[tox]
+envlist =
+    {py27,py33,py34,py35,pypy}-django18
+    {py27,py34,py35,pypy}-django19
+    {py27,py34,py35,pypy}-django10
+skipsdist = True
+
+[testenv]
+
+deps =
+    django18: Django==1.8
+    django19: Django==1.9
+    django10: Django==1.10
+
+commands =
+    python ../../setup.py install
+    python manage.py test
+
+changedir = tests/user_foreign_key_testapp/