[openstreetmap/openstreetmap-website] Switch to using selenium for system tests (#2598)

[Tom Hughes]

This switches to using selenium with a headless firefox to run system tests. I would have preferred to use chrome (possibly running firefox as well in travis at least) but https://bugs.chromium.org/p/chromium/issues/detail?id=775911 means that headless chrome is a pain as we can't control `Accept-Language` fully.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2598

-- Commit Summary --

  * Switch to using selenium for system tests

-- File Changes --

    M .travis.yml (1)
    M Gemfile (1)
    M Gemfile.lock (6)
    M INSTALL.md (6)
    M test/application_system_test_case.rb (14)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2598.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2598.diff

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