Add extra test environments

Author: zakdoek

.travis.yml

@@ -1,9 +1,20 @@
 language: python
 python:
-    - "2.7"
+    - 2.7
+    - 3.4
 env:
+    - DJANGO=django==1.5.10
+    - DJANGO=django==1.6.7
     - DJANGO=django==1.7.7
     - DJANGO=django==1.8
+matrix:
+    exclude:
+        - 
+            python: 3.4
+            env: DJANGO=django==1.5.10
+        -
+            python: 3.4
+            env: DJANGO=django==1.6.7 
 before_install:
     - sudo apt-get install imagemagick
 install: