build on all supported versions of Django

Author: kevin1024

.travis.yml

@@ -1,4 +1,9 @@
 language: python
+env:
+  - DJANGO=1.4
+  - DJANGO=1.5
+  - DJANGO=1.6
+  - DJANGO=1.7
 python:
   - "2.6"
   - "2.7"
@@ -7,5 +12,9 @@ python:
 install:
   - pip install .
   - pip install -r test-requirements.txt
+  - if [ $DJANGO = "1.4" ] ; then pip install https://github.com/django/django/archive/stable/1.4.x.zip#egg=django; fi
+  - if [ $DJANGO = "1.5" ] ; then pip install https://github.com/django/django/archive/stable/1.5.x.zip#egg=django; fi
+  - if [ $DJANGO = "1.6" ] ; then pip install https://github.com/django/django/archive/stable/1.6.x.zip#egg=django; fi
+  - if [ $DJANGO = "1.7" ] ; then pip install https://github.com/django/django/archive/stable/1.7.x.zip#egg=django; fi
 # command to run tests
 script: ./runtests.sh