Remove Capybara-Webkit as project dependency

[lym]

I suggest that we remove capybara-webkit as a project dependency because of the following reasons:

• The test suite as it stands can be run without this gem
• capybara-webkit depends on qtv5.5 which is quite problematic to install in Mac OS Mojave so this might be a potential impediment to developers who have Mojave installed

Ps: I successfully run the test suite after commenting out this gem and installing capybara directly. I ran the tests with the commands, bundle exec rspec and bundle exec rspec spec/features

My environment:

• Mac OS Mojave (10.14.1)

[tarzan]

I dunno, using brew install qt@5.5 just works for me on Mojave.

[lym]

I inherited a project that used this gem some time back and I remember it was such a pain to hook up that we decided to just use Chrome headless for our headless tests. I can't find the links that I visited unfortunately.

How about the first bullet point? Do we actually use this library anywhere in the test code?

[jurre]

If it works without the gem I'm fine with removing it.