diff --git a/.travis.yml b/.travis.yml
index 9b2e47383..2791df6e6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,40 +1,40 @@
 language: python
 
-python: 2.7
-
 sudo: false
 
 env:
-    - TOX_ENV=flake8
-    - TOX_ENV=py3.4-django1.7
-    - TOX_ENV=py3.3-django1.7
-    - TOX_ENV=py3.2-django1.7
-    - TOX_ENV=py2.7-django1.7
-    - TOX_ENV=py3.4-django1.6
-    - TOX_ENV=py3.3-django1.6
-    - TOX_ENV=py3.2-django1.6
-    - TOX_ENV=py2.7-django1.6
-    - TOX_ENV=py2.6-django1.6
-    - TOX_ENV=py3.4-django1.5
-    - TOX_ENV=py3.3-django1.5
-    - TOX_ENV=py3.2-django1.5
-    - TOX_ENV=py2.7-django1.5
-    - TOX_ENV=py2.6-django1.5
-    - TOX_ENV=py2.7-django1.4
-    - TOX_ENV=py2.6-django1.4
-    - TOX_ENV=py3.4-djangomaster
-    - TOX_ENV=py3.3-djangomaster
-    - TOX_ENV=py2.7-djangomaster
+    - TOX_ENV=py27-flake8
+    - TOX_ENV=py34-django1.7
+    - TOX_ENV=py33-django1.7
+    - TOX_ENV=py32-django1.7
+    - TOX_ENV=py27-django1.7
+    - TOX_ENV=py34-django1.6
+    - TOX_ENV=py33-django1.6
+    - TOX_ENV=py32-django1.6
+    - TOX_ENV=py27-django1.6
+    - TOX_ENV=py26-django1.6
+    - TOX_ENV=py34-django1.5
+    - TOX_ENV=py33-django1.5
+    - TOX_ENV=py32-django1.5
+    - TOX_ENV=py27-django1.5
+    - TOX_ENV=py26-django1.5
+    - TOX_ENV=py27-django1.4
+    - TOX_ENV=py26-django1.4
+    - TOX_ENV=py34-djangomaster
+    - TOX_ENV=py33-djangomaster
+    - TOX_ENV=py32-djangomaster
+    - TOX_ENV=py27-djangomaster
 
 matrix:
   fast_finish: true
   allow_failures:
-    - env: TOX_ENV=py3.4-djangomaster
-    - env: TOX_ENV=py3.3-djangomaster
-    - env: TOX_ENV=py2.7-djangomaster
+    - env: TOX_ENV=py34-djangomaster
+    - env: TOX_ENV=py33-djangomaster
+    - env: TOX_ENV=py32-djangomaster
+    - env: TOX_ENV=py27-djangomaster
 
 install:
-  - "pip install tox --download-cache $HOME/.pip-cache"
+  - pip install tox
 
 script:
     - tox -e $TOX_ENV
diff --git a/tox.ini b/tox.ini
index 493712a1b..b1e03580e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,181 +1,31 @@
 [tox]
-downloadcache = {toxworkdir}/cache/
 envlist =
-       flake8,
-       py3.4-django1.7,py3.3-django1.7,py3.2-django1.7,py2.7-django1.7,
-       py3.4-django1.6,py3.3-django1.6,py3.2-django1.6,py2.7-django1.6,py2.6-django1.6,
-       py3.4-django1.5,py3.3-django1.5,py3.2-django1.5,py2.7-django1.5,py2.6-django1.5,
-       py2.7-django1.4,py2.6-django1.4,
-       py3.4-djangomaster,py3.3-djangomaster,py2.7-djangomaster
+       py27-flake8,
+       {py26,py27}-django1.4,
+       {py26,py27,py32,py33,py34}-django{1.5,1.6},
+       {py27,py32,py33,py34}-django{1.7,master}
 
 [testenv]
 commands = ./runtests.py --fast
 setenv =
        PYTHONDONTWRITEBYTECODE=1
+deps =
+       django1.4: django==1.4.11
+       django1.5: django==1.5.6
+       django1.6: Django==1.6.3
+       django1.7: Django==1.7
+       djangomaster: https://github.com/django/django/zipball/master
+       {py26,py27}-django{1.4,1.5,1.6,1.7}: django-guardian==1.2.3
+       {py26,py27}-django{1.4,1.5,1.6}: oauth2==1.5.211
+       {py26,py27}-django{1.4,1.5,1.6}: django-oauth-plus==2.2.1
+       {py26,py27}-django{1.4,1.5}: django-oauth2-provider==0.2.3
+       {py26,py27}-django1.6: django-oauth2-provider==0.2.4
+       pytest-django==2.6.1
+       django-filter==0.7
+       defusedxml==0.3
 
-[testenv:flake8]
-basepython = python2.7
-deps = pytest==2.5.2
+[testenv:py27-flake8]
+deps =
+       pytest==2.5.2
        flake8==2.2.2
 commands = ./runtests.py --lintonly
-
-[testenv:py3.4-django1.7]
-basepython = python3.4
-deps = Django==1.7
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py3.3-django1.7]
-basepython = python3.3
-deps = Django==1.7
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py3.2-django1.7]
-basepython = python3.2
-deps = Django==1.7
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py2.7-django1.7]
-basepython = python2.7
-deps = Django==1.7
-       django-filter==0.7
-       defusedxml==0.3
-       # django-oauth-plus==2.2.1
-       # oauth2==1.5.211
-       # django-oauth2-provider==0.2.4
-       django-guardian==1.2.3
-       pytest-django==2.6.1
-
-[testenv:py3.4-django1.6]
-basepython = python3.4
-deps = Django==1.6.3
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py3.3-django1.6]
-basepython = python3.3
-deps = Django==1.6.3
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py3.2-django1.6]
-basepython = python3.2
-deps = Django==1.6.3
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py2.7-django1.6]
-basepython = python2.7
-deps = Django==1.6.3
-       django-filter==0.7
-       defusedxml==0.3
-       django-oauth-plus==2.2.1
-       oauth2==1.5.211
-       django-oauth2-provider==0.2.4
-       django-guardian==1.2.3
-       pytest-django==2.6.1
-
-[testenv:py2.6-django1.6]
-basepython = python2.6
-deps = Django==1.6.3
-       django-filter==0.7
-       defusedxml==0.3
-       django-oauth-plus==2.2.1
-       oauth2==1.5.211
-       django-oauth2-provider==0.2.4
-       django-guardian==1.2.3
-       pytest-django==2.6.1
-
-[testenv:py3.4-django1.5]
-basepython = python3.4
-deps = django==1.5.6
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py3.3-django1.5]
-basepython = python3.3
-deps = django==1.5.6
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py3.2-django1.5]
-basepython = python3.2
-deps = django==1.5.6
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py2.7-django1.5]
-basepython = python2.7
-deps = django==1.5.6
-       django-filter==0.7
-       defusedxml==0.3
-       django-oauth-plus==2.2.1
-       oauth2==1.5.211
-       django-oauth2-provider==0.2.3
-       django-guardian==1.2.3
-       pytest-django==2.6.1
-
-[testenv:py2.6-django1.5]
-basepython = python2.6
-deps = django==1.5.6
-       django-filter==0.7
-       defusedxml==0.3
-       django-oauth-plus==2.2.1
-       oauth2==1.5.211
-       django-oauth2-provider==0.2.3
-       django-guardian==1.2.3
-       pytest-django==2.6.1
-
-[testenv:py2.7-django1.4]
-basepython = python2.7
-deps = django==1.4.11
-       django-filter==0.7
-       defusedxml==0.3
-       django-oauth-plus==2.2.1
-       oauth2==1.5.211
-       django-oauth2-provider==0.2.3
-       django-guardian==1.2.3
-       pytest-django==2.6.1
-
-[testenv:py2.6-django1.4]
-basepython = python2.6
-deps = django==1.4.11
-       django-filter==0.7
-       defusedxml==0.3
-       django-oauth-plus==2.2.1
-       oauth2==1.5.211
-       django-oauth2-provider==0.2.3
-       django-guardian==1.2.3
-       pytest-django==2.6.1
-
-[testenv:py3.4-djangomaster]
-basepython = python3.4
-deps = https://github.com/django/django/zipball/master
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py3.3-djangomaster]
-basepython = python3.3
-deps = https://github.com/django/django/zipball/master
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1
-
-[testenv:py2.7-djangomaster]
-basepython = python3.2
-deps = https://github.com/django/django/zipball/master
-       django-filter==0.7
-       defusedxml==0.3
-       pytest-django==2.6.1