Add a travis config.

.travis.yml

+language: python
+python:
+  - "2.7"
+  - "3.3"
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -qq gnupg
+  # Workaround for a permissions issue with Travis virtual machine images
+  # that breaks Python's multiprocessing:
+  # https://github.com/travis-ci/travis-cookbooks/issues/155
+  - sudo rm -rf /dev/shm
+  - sudo ln -s /run/shm /dev/shm
+# command to install dependencies
+install:
+  - python setup.py dev
+# command to run tests
+script: "python setup.py test"