Allow users to save server images and reload when starting a new server

[sarahrichmond]

A number of our users often do some kind of configuration to their server environments so that they work the way that they want.

We have had a few requests from people to allow them to 'save' their server image, and provide the option to start in that same environment the next time they spin up a server.

Some initial comments for consideration:

• Allowing people to upload/run up their own image poses some large security concerns. We should avoid this.
• We could take a snapshot of their current image and store that somewhere, but would need some good rules and protocols around this.