Add reify_original method.

[joshuapinter]

Returning the original version is a common use-case and is not as easy as it should be, particularly because calling reify on the first version returns nil, which is the object before it was created.

This method simply tries to reify from the second version, if it exists. If it doesn’t exist (i.e. there has not been any changes to the object), it falls back to self, which is the original and only version of the object.

Fixes #1204.

Thank you for your contribution!

Check the following boxes:

• Wrote good commit messages.
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new
  code introduces user-observable changes.
• The PR relates to only one subject with a clear title
  and description in grammatically correct, complete sentences.

[github-actions]

This PR has been automatically marked as stale due to inactivity.
The resources of our volunteers are limited.
If this is something you are committed to continue working on, please address any concerns raised by review and/or ping us again.
Thank you for all your contributions.

[joshuapinter]

Okay, I've added specs and an entry into the CHANGELOG. This PR should be ready for review and merging.

Let me know if you would like to see any changes.

Thanks.

[github-actions]

This PR has been automatically marked as stale due to inactivity.
The resources of our volunteers are limited.
If this is something you are committed to continue working on, please address any concerns raised by review and/or ping us again.
Thank you for all your contributions.

[joshuapinter]

@fatkodima This PR isn't stale. It should be good to go now. I've added specs and a CHANGELOG entry. Can you take a look and let me know if anything else needs to be done for it to be merged?

Many thanks!

[github-actions]

This PR has been automatically marked as stale due to inactivity.
The resources of our volunteers are limited.
If this is something you are committed to continue working on, please address any concerns raised by review and/or ping us again.
Thank you for all your contributions.

[joshuapinter]

Not stale. I just rebased and it's ready for review and to be merged if all good. Anybody...?

[github-actions]

This PR has been automatically marked as stale due to inactivity.
The resources of our volunteers are limited.
If this is something you are committed to continue working on, please address any concerns raised by review and/or ping us again.
Thank you for all your contributions.

[joshuapinter]

Not Stale. @fatkodima Can we please get this merged in? Tests and everything are done. Working great in our production environment for the last year. Thanks!