We need to support new webdrivers

[rouke-broersma]

Microsoft has created a webdriver for Edge browser
Mozilla has created a webdriver for Firefox 45+ (and old driver will be deprecated)
Opera has created a webdriver for OperaBlink and the old opera driver has already been deprecated

We need to support these new drivers somehow, but also keep support for the old browser version that the new drivers do not support.

[flipy]

Would it be possible to create 2 firefox browsers, one with the old driver which requires the binary path, and one for the new one which requires path for the geckodriver?

[rouke-broersma]

@flipy

Would it be possible to create 2 firefox browsers, one with the old driver which requires the binary path, and one for the new one which requires path for the geckodriver?

I welcome any pull request to add this functionality