Replace chromedriver-helper with webdrivers

[rossta]

The chromedriver-helper project is unsupported as of 2019/03/13 and the project owner is encouraging developers to switch to the webdrivers gem. See https://github.com/flavorjones/chromedriver-helper/issues/83

[jejacks0n]

❤️ I was just doing this. haha, I'll let things pass and then merge.

[jejacks0n]

You can keep looking into this, or you can let me -- either way, I appreciate your efforts.

[rossta]

I left the existing registered drivers in place, but I found that the more-recent versions of Capybara provide selenium_chrome and selenium_chrome_headless drivers that may work for you.

Aside from that, feel free to take over at this point. Thanks!

[rossta]

@jejacks0n Just checking in to see if any more changes are needed before this is ready to merge. Thanks!