[openstreetmap/openstreetmap-website] Add In-Reply-To, References headers to email (#2462)

[mmd]

Closes https://github.com/openstreetmap/openstreetmap-website/issues/2430
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2462

-- Commit Summary --

  * Add In-Reply-To, References headers to email

-- File Changes --

    M app/mailers/notifier.rb (13)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2462.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2462.diff

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