Set WebDriver window size from configuration

Change-Id: Ie3bb09e5f717fce9adfc1b1d76f6802d40d262ac
Reviewed-on: https://pirx.atteo.com/gerrit/576
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>
Run tests multiple times for different config file combinations

Change-Id: Id97b21266938450666e9e3dd8c0c58c078f613e1
Reviewed-on: https://pirx.atteo.com/gerrit/581
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>
WebDriverHelper.screenshot()

Change-Id: I8546d94c0dd8c6ff0d241e567393904f0e86ec79
Reviewed-on: https://pirx.atteo.com/gerrit/582
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>