[openstreetmap/openstreetmap-website] Add microcosms to the website (#2390)

[Brian DeRocher]

@gravitystorm I'm following up on the change to replace geckodriver in .travis.yml with using the titusfortner/webdrivers gem.  Somehow it works locally (yes, I've taken geckodriver out my $PATH).  But tests fail on travis because webmock is preventing the download of the webdrivers.

I looked back in the git history to see where webmock was introduced and why.  Seems to be used in test_helper.rb in with_http_stubs().  So instead of calling out to geonames, geocoder_ca, and nominatim, we just return data from disk.

The policy to disable network connection (except for localhost) is also in test_helper.rb line 24.

Looks like webmock allows a whitelist of allowed sites.  https://www.rubydoc.info/gems/webmock/2.0.2#External_requests_can_be_disabled_while_allowing_specific_requests  I would add for example https://chromedriver.storage.googleapis.com

Do you suggest doing that?

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