Add a minimal .travis.yml file to suppress build spam

Until the travis-config branch is merged in, this can be spread around to avoid
wasting time running builds before we're ready

Author: acdha

Diff for: .travis.yml

@@ -0,0 +1,9 @@
+language: python
+python:
+    - "2.6"
+    - "2.7"
+    - "3.2"
+
+branches:
+    only:
+        - travis-config