[openstreetmap/openstreetmap-website] Added distance of traces to model and view (#1942)

[Jamie Guthrie]

 - Migrated a new column (trace-length)
 - Added 'Distance' row in trace view
 - Calculates distance between each point using haversine formula
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1942

-- Commit Summary --

  * Added distance of traces to model and view

-- File Changes --

    M app/models/trace.rb (8)
    M app/views/traces/view.html.erb (3)
    M config/locales/en.yml (1)
    A db/migrate/20180726180947_add_length_to_trace.rb (9)
    M lib/gpx.rb (29)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1942.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1942.diff

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