[Fix #9803] Update Bundler/GemVersion to check commit references

[timlkelly]

#9807 seems to be stale. This pull request completes the work it set out to do and will close #9803 and #9807.

I originally wanted to create a pull request to merge into #9807, however, I was not able to figure that out. Probably due to my inexperience when working on git projects across multiple forks.

This differs slightly from #9807 given the conversation that has happened in that pull request:

• This proposal does not take the hosted git service into consideration
• This proposal also checks for branch

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Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[bbatsov]

Looks good to me! Thanks for driving it to the finish line!