Merge pull request php-vcr#235 from tiagobrito/Allow-symfony/yaml-v4-… …as-dependency [RFC] Allow symfony/yaml and symfony/event-dispatcher v4.0 as dependency

Merge pull request php-vcr#206 from alnorth/empty-string-post-fix Make handling of empty strings in CURLOPT_POSTFIELDS consistent.

Merge pull request php-vcr#220 from renatomefi/pr/192 CurlHook now returns integer HTTP status codes

Merge pull request php-vcr#218 from renatomefi/fix/pr-215-host-header When setting the Host header check if it's not null

Merge pull request php-vcr#186 from tmdk/fix-custom-request Always override request method if CURLOPT_CUSTOMREQUEST is set

Merge pull request php-vcr#151 from thormeier/fix-parallel-curl-requests Fix parallel cURL requests

Merge pull request php-vcr#171 from renatomefi/pr/154 Fixes php-vcr#153: SoapClient::__getLastRequest() returns NULL in PHP 5.3 and 5.4

Merge pull request php-vcr#163 from alnorth/headers-with-colons Fix for parsing header values that include colons followed by spaces

Merge pull request php-vcr#148 from migros/master 

Merge pull request php-vcr#144 from dbu/patch-2 provide more information when not in recording mode