Better JKU/X5U support

composer.json

@@ -31,8 +31,11 @@
         "ext-mbstring": "*",
         "lib-openssl": "*",
         "fgrosse/phpasn1": "^2.0",
+        "http-interop/http-factory": "^0.3.0",
         "paragonie/sodium_compat": "^1.1",
+        "php-http/guzzle6-adapter": "^1.1.1",
         "php-http/httplug": "^1.1",
+        "php-http/httplug-bundle": "^1.7",
         "php-http/message-factory": "^1.0",
         "spomky-labs/aes-key-wrap": "^4.0",
         "spomky-labs/base64url": "^1.0",
@@ -51,7 +54,6 @@
         "behat/symfony2-extension": "^2.1",
         "bjeavons/zxcvbn-php": "^0.3.0",
         "padraic/phar-updater": "^1.0",
-        "php-http/guzzle6-adapter": "^1.1.1",
         "phpbench/phpbench": "^0.13.0",
         "phpunit/phpunit": "^6.0",
         "satooshi/php-coveralls": "^1.0",