Merge branch 'final-geard-purge-608' into better-volume-support-in-dockerclient-234
Sketch of changes to Docker client.
Sketch of new alternative to Volume.expose_to_docker.
Merge remote-tracking branch 'origin/master' into better-volume-support-in-dockerclient-234
Merge remote-tracking branch 'refs/remotes/origin/master' into better-volume-support-in-dockerclient-234
Update documentation to note we no longer have a container-data helper container.
Merge remote-tracking branch 'refs/remotes/origin/master' into better-volume-support-in-dockerclient-234

Conflicts:
	flocker/node/_docker.py
Merge remote-tracking branch 'refs/remotes/origin/master' into better-volume-support-in-dockerclient-234

Conflicts:
	flocker/node/_deploy.py
	flocker/node/_docker.py
	flocker/volume/service.py
Rip out tests that are now unnecessary.
Unit tests for generic IDockerClient volume support (excluding those that will be done in #289).
Add volume support to DockerClient.
Hook up new Docker volume logic to the Deployer.
Lint fix.
Merge remote-tracking branch 'refs/remotes/origin/master' into better-volume-support-in-dockerclient-234
Merge remote-tracking branch 'refs/remotes/origin/master' into better-volume-support-in-dockerclient-234
Address review comment: List comprehension.
Address review comment: Link to issue.
Address review comment: Fix docstring.
Address review comment: Correct arguments.
Merge remote-tracking branch 'refs/remotes/origin/master' into better-volume-support-in-dockerclient-234