Flocker deploy 121

I would like this to be looked over by someone, for guidance on what needs to be done, and confirmation I'm on the right track.

And, now, the comment on #121 that some of this might not be necessary for now.

There are a couple of inline "TODO"s I'm not sure about.

Fixes #121 
The contents of this are not tested, but neither are the other two `longdesc`s in the codebase.

There is an blank line here. This is because there is a blank line in `VolumeOptions`'s `longdesc`. There is no blank line in `_ReceiveSubcommandOptions`'s `longdesc`. I'm guessing that these should be consistent but I'm unsure which is best.