Cleanups for Cleaning Up

This release includes multiple improvements for helping keep your backup history neat and tidy.

What's Changed

• Better handling for backups with "nothing to commit" by @OpenBagTwo in #61
  • Added a new flag: gsb backup --ignore-empty that will return a 0 exit code even if there's nothing to commit
  • Fixeed behavior where deleting a backup between two identical backups fails
• Removed debug line by @OpenBagTwo in #62
• Added more functionality to rewind by @OpenBagTwo in #63
  • Added the command-line-flag --hard to gsb rewind, which is essentially the equivalent of a git reset --hard HEAD by default, and which can be used to erase all progress after the specified revision
  • Added the command-line-flag --delete-original to gsb rewind, which, upon restoring to a backup, will delete the original backup from the history
  • Normalized some command-line flags to use hyphens instead of underscores
  • ed18c4b fixes some coverage exclusions

Full Changelog: v0.0.4...v0.0.5