Adding Travis CI configuration

.travis.yml

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+# Configuration for Travis CI
+
+language: python
+python:
+  - "2.5"
+  - "2.6"
+  - "2.7"
+# command to install dependencies
+install:
+  - pip install -r test_requirements.txt --use-mirrors
+# command to run tests
+script:
+  - python setup.py test -q

test_requirements.txt

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+# Requirements used for testing
+mock >= 0.5.0
+meld3 >= 0.6.5