Add testing on (prerelease) Django 1.5 (including python 3.2)

.travis.yml

@@ -2,10 +2,18 @@ language: python
 python:
   - "2.6"
   - "2.7"
+  - "3.2"
 env:
-  - DJANGO_VERSION=1.3
-  - DJANGO_VERSION=1.4
+  - DJANGO=django==1.3
+  - DJANGO=django==1.4
+  - DJANGO=https://github.com/django/django/tarball/stable/1.5.x
+matrix:
+  exclude:
+    - python: "3.2"
+      env: DJANGO=django==1.3
+    - python: "3.2"
+      env: DJANGO=django==1.4
 install:
-  - pip install -q Django==$DJANGO_VERSION
+  - pip install -q $DJANGO --use-mirrors
   - pip install . --use-mirrors
 script: python setup.py test