added travis

.travis.yml

+language: python
+python:
+  - "2.7"
+  - "2.6"
+# command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
+install: "pip install -r requirements.txt"
+# command to run tests, e.g. python setup.py test
+script: "python manage.py test"
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