Add `check` command

• Add check command to validate existing manifest files against directory contents.

Also upgrades most dependencies.

0.6.0 - Flag to accept version-only changes

• Add --accept-identical-versions flag to accept version-only JSON changes.

0.5.0 - Ignore version-number only changes

• JSON files with changes only to the version field are no longer counted as changed

0.4.0 - Commit sorting

• Improve commit message sorting by using natural sort
• Add top-level --version option

0.3.0 - Metadata field

• Add metadata field capture for JSON

0.2.1

• Fixes tracking branch reading

0.2.0 - Git reset improvement

• live-import improvements:
  • When using --git-reset the tracking branch will be read instead of assumed
  • --git-reset also removes untracked files with git clean -fd