[openstreetmap-website] API: query changesets by ids (#608)

[Simon Legner]

Make changesets query-able by specifying a list of ids, e.g., `/api/0.6/changesets?changesets=1,2,3`. (Related to #534, #584.)
You can merge this Pull Request by running:

  git pull https://github.com/simon04/openstreetmap-website changesets_ids

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/608

-- Commit Summary --

  * API: query changesets by ids

-- File Changes --

    M app/controllers/changeset_controller.rb (13)
    M test/functional/changeset_controller_test.rb (8)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/608.patch
https://github.com/openstreetmap/openstreetmap-website/pull/608.diff
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