Update Django versions and add Django 1.9

Author: Julien Pivotto

.travis.yml

@@ -8,8 +8,18 @@ python:
 env:
   - DJANGO=1.5.12 MIGRATE='true'
   - DJANGO=1.6.11 MIGRATE='true'
-  - DJANGO=1.7.7 MIGRATE='./manage.py migrate'
-  - DJANGO=1.8.5 MIGRATE='./manage.py migrate'
+  - DJANGO=1.7.11 MIGRATE='./manage.py migrate'
+  - DJANGO=1.8.7 MIGRATE='./manage.py migrate'
+  - DJANGO=1.9 MIGRATE='./manage.py migrate'
+
+matrix:
+  allow_failure:
+    - env: DJANGO=1.9 MIGRATE='./manage.py migrate'
+      python: 2.7
+    - env: DJANGO=1.9 MIGRATE='./manage.py migrate'
+      python: 3.3
+    - env: DJANGO=1.9 MIGRATE='./manage.py migrate'
+      python: 3.4
 
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