Only build pushes to master to avoid duplicate travis builds on PRs

.travis.yml

@@ -2,6 +2,9 @@ language: python
 python:
   - 2.7
   - 3.4
+branches:
+  only:
+    - master
 env:
   - DJANGO_VERSION=1.8.17
   - DJANGO_VERSION=1.9.12