Adding sample code to list servers.
Updating user guide with boot-from-volume example.
Adding unit test for boot-from-volume.
Adding sample code showing server creation using boot-from-volume.
Adding server creation code to support boot-from-volume.
Removing now-unnecessary comment.
Making markdown consistent.
Extracting variable.
Merge pull request #407 from ycombinator/bfv

Boot from volume support