Split the backups create API code into its own file.
Use more genuine test data.
time.Minute is already a duration.
Document some constants and eliminate the global vars.
Drop the metadata() method.
Get rid of unnecessary constants.
Use Fatalf().
Use format instead of ChecksumFormat.
Fix gocheck imports.
Merge pull request #819 from ericsnowcurrently/backups-separate-api-files

Split the backups create API code into its own file.