Define overall approach

Scripting deployment to a VPS is a lot different than scripting deployment to a PAAS provider. There's a bunch of core infrastructure stuff to manage in addition to the Django-specific work.

Tasks
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- [ ] Outline first draft of overall approach
- [ ] Identify open questions related to supporting a VPS deployment
- [ ] Write an implementation
- [ ] Consider additional CLI args for this kind of deployment, ie `--db sqlite | postgres`.
- [ ] Don't add a flag to use a Dockerfile? That should be a separate plugin, so docker people can refine a more focused plugin, rather than trying to work within a Swiss army knife plugin. `dsd-vps-docker`.
- [ ] Review [Heroku alternatives](https://gist.github.com/ptman/1b9e3a992e6c8aeecc86b5f1fd1c5f61)