Added Django 1.5 and upgrade to 1.4.5 and 1.3.7.

Author: jezdez

.travis.yml

@@ -3,8 +3,9 @@ python:
   - "2.6"
   - "2.7"
 env:
-  - DJANGO_VERSION=1.3.1
-  - DJANGO_VERSION=1.4
+  - DJANGO_VERSION=1.3.7
+  - DJANGO_VERSION=1.4.5
+  - DJANGO_VERSION=1.5
 install:
   - pip install Django==$DJANGO_VERSION
   - python setup.py install