Version control for snippets

Original title: "Snippets backed by a git repository to enable cloning and revisions"

Have snippets in a git repository just like the wiki

Report: https://news.ycombinator.com/item?id=11095652

Feedback tracker items:

• http://feedback.gitlab.com/forums/176466-deprecated-feedback-forum/suggestions/5798509-clone-snippets-via-git
• http://feedback.gitlab.com/forums/176466-deprecated-feedback-forum/suggestions/4286682-repo-based-snippets
• http://feedback.gitlab.com/forums/176466-deprecated-feedback-forum/suggestions/6637419-snippet-revisions-comments

I would love to see this.

/cc @dzaporozhets @JobV

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