Adds travis.yml for 2.5 branch

.travis.yml

@@ -0,0 +1,7 @@
+language: python
+python:
+    - 2.6
+    - 2.7
+install:
+    - pip install --use-mirrors tox
+script: TOXENV=py$(echo $TRAVIS_PYTHON_VERSION | tr -d .) tox