Address review comment: Misspeak.
Address review comment: more accurate comments.
Address review comment: explain what the issue is.
Address review comment: More sensible image name.
Address review comment: typo.
Address review comment: Note another missing feature.
Merge pull request #372 from ClusterHQ/determine-volume-changes-272

Determine necessary volume changes as part of a deploy.

Fixes #272.
Merge remote-tracking branch 'refs/remotes/origin/master' into statechange-refactor-361
Link to more details about what handoff means.
Move proxy logic into SetProxies.