[openstreetmap/openstreetmap-website] Set up Delayed Job as the backend for Active Job (#2037)

[Andy Allan]

This persists jobs into the database, and uses locking to ensure that workers from multiple machines avoid treading on each other.

Jobs can be run by using `bundle exec rake jobs:work`

Fixes #2015
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2037

-- Commit Summary --

  * Set up Delayed Job as the backend for Active Job

-- File Changes --

    M Gemfile (1)
    M Gemfile.lock (6)
    M config/application.rb (3)
    A db/migrate/20181031113522_create_delayed_jobs.rb (22)
    M db/structure.sql (62)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2037.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2037.diff

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