Issue #1977570 by RobLoach: Update third-party vendors and fix composer.json

composer.json

composer.lock

core/.gitignore

core/vendor/autoload.php

core/vendor/composer/ClassLoader.php

core/vendor/composer/autoload_classmap.php

core/vendor/composer/autoload_namespaces.php

core/vendor/composer/autoload_real.php

core/vendor/composer/include_paths.php

core/vendor/composer/installed.json

core/vendor/guzzle/common/Guzzle/Common/Collection.php

core/vendor/guzzle/common/Guzzle/Common/Version.php

core/vendor/guzzle/http/Guzzle/Http/Client.php

core/vendor/guzzle/http/Guzzle/Http/Curl/CurlHandle.php

core/vendor/guzzle/http/Guzzle/Http/QueryString.php

core/vendor/guzzle/http/Guzzle/Http/RedirectPlugin.php

core/vendor/guzzle/http/Guzzle/Http/composer.json

core/vendor/kriswallsmith/assetic/.travis.yml

core/vendor/kriswallsmith/assetic/CHANGELOG-1.1.md

core/vendor/kriswallsmith/assetic/LICENSE