Release flocker 0.2.0 - 795

 * Docs: https://docs.clusterhq.com/en/0.2.0/
 * Wheel: https://storage.googleapis.com/archive.clusterhq.com/downloads/flocker/Flocker-0.2.0-py2-none-any.whl
 * Sdist: https://storage.googleapis.com/archive.clusterhq.com/downloads/flocker/Flocker-0.2.0.tar.gz
 * Tutorial Base Box: https://storage.googleapis.com/clusterhq-vagrant/flocker-tutorial-0.2.0.box
 * Vagrant Cloud: https://vagrantcloud.com/clusterhq/boxes/flocker-tutorial/versions/3
 * HomeBrew recipe for review: https://github.com/ClusterHQ/homebrew-tap/pull/9

Fixes #795