Add Get() to the backups abstraction.
Add the Info() end-point to the state API for backups.
Add the API client method for info.
Add the backups info subcommand.
Fix up doc comments.
Use Fatalf().
Add a missing doc comment.
Fix gocheck imports.
Adjust to baseSuite.
Merge pull request #820 from ericsnowcurrently/backups-get

Add the Backups Get/Info method.