Issue #2210637 by damiankloip | Crell: Upgrade to Guzzle 4.

composer.json

composer.lock

core/core.services.yml

core/includes/install.core.inc

core/lib/Drupal.php

core/lib/Drupal/Core/Http/Client.php

...upal/Core/Http/Plugin/SimpletestHttpRequestSubscriber.php

...les/aggregator/lib/Drupal/aggregator/Form/OpmlFeedAdd.php

...l/aggregator/Plugin/aggregator/fetcher/DefaultFetcher.php

...aggregator_test/Plugin/aggregator/fetcher/TestFetcher.php

...es/hal/lib/Drupal/hal/Normalizer/FileEntityNormalizer.php

core/modules/locale/locale.batch.inc

...stics/lib/Drupal/statistics/Tests/StatisticsAdminTest.php

...ics/lib/Drupal/statistics/Tests/StatisticsLoggingTest.php

...ics/lib/Drupal/statistics/Tests/StatisticsReportsTest.php

...ib/Drupal/statistics/Tests/StatisticsTokenReplaceTest.php

...ics/lib/Drupal/statistics/Tests/Views/IntegrationTest.php

core/modules/system/system.module

core/modules/update/lib/Drupal/update/UpdateFetcher.php

...es/update/tests/Drupal/update/Tests/UpdateFetcherTest.php