Port interesting features of the "giorgiosironi/phpunit-selenium"

[aik099]

I've noticed, that https://github.com/giorgiosironi/phpunit-selenium/ project (which inspired me to create this project) is still pretty much alive.

Also it's being used in the BrowserStack DEMO project for PHP integration (see https://github.com/browserstack/phpunit-browserstack). Apparently, giorgiosironi/phpunit-selenium has some benefits (either in features or maintainability) compared to the PHPUnit-Mink.

Need to:

1. discover features (including ways how the test suite is written) of the giorgiosironi/phpunit-selenium, that PHPUnit-Mink might benefit from;
2. add these features to this project.

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My initial commit was on Jun 1, 2013, but apparently, development was started earlier. My best guess is, that I've used

• either https://github.com/giorgiosironi/phpunit-selenium/releases/tag/1.2.12 (Feb 2, 2013)
• or https://github.com/giorgiosironi/phpunit-selenium/releases/tag/1.3.0 (May 6, 2013)

as a starting point.