Added guzzle Verify SSL option for local development

[vitalyiegorov]

Usually for local development you create self signed SSL certificates, this PR resolves guzzle/curl error:

cURL error 60: SSL certificate problem: self signed certificate (see http://curl.haxx.se/libcurl/c/libcurl-errors.html) (GuzzleHttp\Exception\RequestException)

[vitalyiegorov]

@christeredvartsen Closes #65

[christeredvartsen]

Would it be better to just forward whatever is set in the apiClient part of the extension configuration to the Guzzle constructor, instead of specifying specific options?

You could then configure the Behat extension like this:

default:
    extensions:
        Imbo\BehatApiExtension:
            apiClient:
                base_uri: https://some.uri
                verify: false
                headers: 
                    x-some-header: value

[vitalyiegorov]

@christeredvartsen Updated PR and tests to pass whole array from

apiClient:
   ...

to Guzzle client initialization

[vitalyiegorov]

@christeredvartsen Can we merge this PR?

[christeredvartsen]

Can we merge this PR?

Hold your :horse: there cowboy. I'll have a look at the code changes after work.

[vitalyiegorov]

@christeredvartsen Howdy Sheriff, have you had a chance to check it?

[christeredvartsen]

Superseded by #67.