Tests to verify, that cookies set on different paths works correctly

Before this test was added nobody was checking, that cookies set on different paths works properly.

I've created this tests to verify, that following PR's work properly:

* https://github.com/Behat/MinkSeleniumDriver/pull/22
* https://github.com/Behat/MinkSahiDriver/pull/22
* https://github.com/Behat/MinkZombieDriver/pull/53