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
Adding DB samples.
Need to pass in name when creating a DB instance.
Renaming variable for clarity.
Renaming.
Adding sample code for retrieving an instance.
Adding executable samples.
Adding tests and code for configurations.
Adding docs for configurations.
Removing var_dumps.
Adding sample code for datastores.
Adding documentation for data stores.