add travis ci

.travis.yml

@@ -0,0 +1,7 @@
+language: python
+python:
+  - "2.7"
+# command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
+install: "pip install -r requirements.txt --use-mirrors"
+# command to run tests, e.g. python setup.py test
+script: nosetests