Correct BrowserKitFactory to support the 'http_client_parameters' option

[BastienGarcia]

Follow up to #22.

A new option to configure the BrowserKitDriver client was added in the previous PR, however, the configuration could not be added to the configuration file as it would return the following error: Unrecognized option "http_client_parameters".
This PR allows the use of the option, for exemple:

default:
  suites:
    default:
      path: "%paths.base%/features"
      contexts: [Behat\MinkExtension\Context\MinkContext]
  extensions:
    Behat\MinkExtension:
      base_url: http://en.wikipedia.org/
      sessions:
        default:
          browserkit_http:
            http_client_parameters:
                verify_host: false
                verify_peer: false

[stronk7]

Nice one @BastienGarcia.

Hope this is accepted and rolled into a minor release (we certainly need to be able to, exactly, disable those cert verifications here for some good tests to proceed!

[BastienGarcia]

@Yozhef sorry for pinging you once again

[Yozhef]

@BastienGarcia I am very sorry for the long answer, unfortunately there is a war going on in my country and I cannot allocate enough time at the moment (Please accept my apologies
Release 2.7.4