Update capabilities supported by BrowserStack real device automation …

[citymarkm]

…and popup controls

See https://www.browserstack.com/automate/behat

[citymarkm]

The failure in Ci seems to be environmental?

[citymarkm]

Remove comment and tied up indenting. Same issue,

[WWVengerov]

We are also trying out the latest Mink with BrowserStack and have experienced the same issue with unsupported capabilities. Would be really nice to finally merge this pull request :-)

[carlcasbolt]

@citymarkm - This needs a rebase from master and the travis tests will pass

[oradwell]

just found out you can achieve this by using extra_capabilities config like so:

browser_stack:
    capabilities:
        device: iPhone 7
        extra_capabilities:
            real_mobile: true
            browserstack-ie-enablePopups: true
            browserstack-safari-enablePopups: true

also version capability can be used instead of browser_version