Update travis config to test py3k and django master

.travis.yml

@@ -3,17 +3,28 @@ language: python
 python:
   - "2.6"
   - "2.7"
+  - "3.2"
+  - "3.3"
 
 env:
+  - DJANGO=https://github.com/django/django/archive/master.tar.gz
   - DJANGO=django==1.5 --use-mirrors
   - DJANGO=django==1.4.5 --use-mirrors
-  - DJANGO=django==1.3.7 --use-mirrors
 
 install:
   - pip install $DJANGO
+  - pip install -r requirements/travis-ci.txt --use-mirrors
 
 script:
-  - python setup.py test
+  - coverage run --source django_taggit runtests.py
+  - coverage report
 
 notifications:
   email: false
+
+matrix:
+  exclude:
+    - python: "3.2"
+      env: DJANGO=django==1.4.5 --use-mirrors
+    - python: "3.3"
+      env: DJANGO=django==1.4.5 --use-mirrors