Add Travis CI config

Currently we run the following:

* Python and documentation style checks
* Documentation build
* Python unit tests

.travis.yml

+---
+language: python
+python: "2.7"
+
+# Use the new container infrastructure
+sudo: false
+
+# Install ansible
+addons:
+  apt:
+    packages:
+      - gcc
+      - python-virtualenv
+
+install:
+  - virtualenv venv
+  - venv/bin/pip install -U pip
+  - venv/bin/pip install tox
+
+script:
+  # Run python style checks.
+  - venv/bin/tox -e pep8
+
+  # Build documentation.
+  - venv/bin/tox -e docs
+
+  # Run python2.7 unit tests.
+  - venv/bin/tox -e py27

tox.ini

@@ -15,7 +15,7 @@ commands = unit2 discover {posargs}
 
 [testenv:pep8]
 commands =
-  flake8 {posargs}
+  flake8 {posargs} kayobe
   # Check the *.rst files
   # We use a thin wrapper around doc8 currently, which has support for sphinx
   # directives. We install sphinx 1.5.x because versions prior to this