Fix dependancies

requirements.txt

@@ -9,10 +9,5 @@ flake8==2.2.2
 
 # Optional packages
 markdown>=2.1.0
-PyYAML>=3.10
-defusedxml>=0.3
 django-guardian==1.2.4
 django-filter>=0.5.4
-django-oauth-plus>=2.2.1
-oauth2>=1.5.211
-django-oauth2-provider>=0.2.4

tox.ini

@@ -3,7 +3,8 @@ envlist =
        py27-{flake8,docs},
        {py26,py27}-django14,
        {py26,py27,py32,py33,py34}-django{15,16},
-       {py27,py32,py33,py34}-django{17,master}
+       {py27,py32,py33,py34}-django17,
+       {py27,py32,py33,py34}-djangomaster
 
 [testenv]
 commands = ./runtests.py --fast
@@ -15,10 +16,9 @@ deps =
        django16: Django==1.6.8
        django17: Django==1.7.1
        djangomaster: https://github.com/django/django/zipball/master
-       {py26,py27}-django{14,15,16,17}: django-guardian==1.2.3
+       django-guardian==1.2.4
        pytest-django==2.6.1
-       django-filter==0.7
-       defusedxml==0.3
+       django-filter==0.9.1
        markdown>=2.1.0
 
 [testenv:py27-flake8]