diff --git a/api/composer.json b/api/composer.json
index 10d6da5c..b91d34b5 100644
--- a/api/composer.json
+++ b/api/composer.json
@@ -10,17 +10,12 @@
     }
   ],
   "require-dev": {
-    "phpunit/phpunit": "6.3.0"
+    "phpunit/phpunit": "6.3.0",
+    "clue/graph-composer": "^1.0"
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   "require": {
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-    "mike-koch/mailgun-php": "^2.1",
-    "php-http/guzzle6-adapter": "^1.1",
-    "php-http/message": "^1.5",
-    "php-http/curl-client": "^1.7",
-    "mike-koch/psr7": "1.4.2.1",
-    "mike-koch/promises": "1.3.1.1",
-    "mike-koch/guzzle": "6.3.0.2",
+    "mailgun/mailgun-php": "1.7.2",
     "mike-koch/php-di": "4.4.11",
     "doctrine/annotations": "1.2"
   }
diff --git a/api/composer.lock b/api/composer.lock
index a32e724c..1668fba8 100644
--- a/api/composer.lock
+++ b/api/composer.lock
@@ -4,60 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
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+    "content-hash": "cba4f6a9b461d9050bd4095da7c79aea",
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-            "autoload": {
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-                },
-                "files": [
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-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Christian Lück",
-                    "email": "christian@lueck.tv"
-                }
-            ],
-            "description": "A simple and modern approach to stream filtering in PHP",
-            "homepage": "https://github.com/clue/php-stream-filter",
-            "keywords": [
-                "bucket brigade",
-                "callback",
-                "filter",
-                "php_user_filter",
-                "stream",
-                "stream_filter_append",
-                "stream_filter_register"
-            ],
-            "time": "2017-08-18T09:54:01+00:00"
-        },
         {
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             "version": "1.2.0",
@@ -291,44 +239,70 @@
             "time": "2014-09-09T13:34:57+00:00"
         },
         {
-            "name": "guzzlehttp/guzzle",
-            "version": "6.3.0",
+            "name": "guzzle/guzzle",
+            "version": "v3.9.3",
             "source": {
                 "type": "git",
-                "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699"
+                "url": "https://github.com/guzzle/guzzle3.git",
+                "reference": "0645b70d953bc1c067bbc8d5bc53194706b628d9"
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-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699",
+                "url": "https://api.github.com/repos/guzzle/guzzle3/zipball/0645b70d953bc1c067bbc8d5bc53194706b628d9",
+                "reference": "0645b70d953bc1c067bbc8d5bc53194706b628d9",
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             },
             "require": {
-                "guzzlehttp/promises": "^1.0",
-                "guzzlehttp/psr7": "^1.4",
-                "php": ">=5.5"
+                "ext-curl": "*",
+                "php": ">=5.3.3",
+                "symfony/event-dispatcher": "~2.1"
+            },
+            "replace": {
+                "guzzle/batch": "self.version",
+                "guzzle/cache": "self.version",
+                "guzzle/common": "self.version",
+                "guzzle/http": "self.version",
+                "guzzle/inflection": "self.version",
+                "guzzle/iterator": "self.version",
+                "guzzle/log": "self.version",
+                "guzzle/parser": "self.version",
+                "guzzle/plugin": "self.version",
+                "guzzle/plugin-async": "self.version",
+                "guzzle/plugin-backoff": "self.version",
+                "guzzle/plugin-cache": "self.version",
+                "guzzle/plugin-cookie": "self.version",
+                "guzzle/plugin-curlauth": "self.version",
+                "guzzle/plugin-error-response": "self.version",
+                "guzzle/plugin-history": "self.version",
+                "guzzle/plugin-log": "self.version",
+                "guzzle/plugin-md5": "self.version",
+                "guzzle/plugin-mock": "self.version",
+                "guzzle/plugin-oauth": "self.version",
+                "guzzle/service": "self.version",
+                "guzzle/stream": "self.version"
             },
             "require-dev": {
-                "ext-curl": "*",
-                "phpunit/phpunit": "^4.0 || ^5.0",
-                "psr/log": "^1.0"
+                "doctrine/cache": "~1.3",
+                "monolog/monolog": "~1.0",
+                "phpunit/phpunit": "3.7.*",
+                "psr/log": "~1.0",
+                "symfony/class-loader": "~2.1",
+                "zendframework/zend-cache": "2.*,<2.3",
+                "zendframework/zend-log": "2.*,<2.3"
             },
             "suggest": {
-                "psr/log": "Required for using the Log middleware"
+                "guzzlehttp/guzzle": "Guzzle 5 has moved to a new package name. The package you have installed, Guzzle 3, is deprecated."
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.2-dev"
+                    "dev-master": "3.9-dev"
                 }
             },
             "autoload": {
-                "files": [
-                    "src/functions_include.php"
-                ],
-                "psr-4": {
-                    "GuzzleHttp\\": "src/"
+                "psr-0": {
+                    "Guzzle": "src/",
+                    "Guzzle\\Tests": "tests/"
                 }
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             "notification-url": "https://packagist.org/downloads/",
@@ -340,9 +314,13 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Guzzle Community",
+                    "homepage": "https://github.com/guzzle/guzzle/contributors"
                 }
             ],
-            "description": "Guzzle is a PHP HTTP client library",
+            "description": "PHP HTTP client. This library is deprecated in favor of https://packagist.org/packages/guzzlehttp/guzzle",
             "homepage": "http://guzzlephp.org/",
             "keywords": [
                 "client",
@@ -353,155 +331,33 @@
                 "rest",
                 "web service"
             ],
-            "time": "2017-06-22T18:50:49+00:00"
-        },
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-            "version": "v1.3.1",
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-                }
-            },
-            "autoload": {
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-                },
-                "files": [
-                    "src/functions_include.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            ],
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-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
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-            "description": "Guzzle promises library",
-            "keywords": [
-                "promise"
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-            "time": "2016-12-20T10:07:11+00:00"
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-            "version": "1.4.2",
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-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            ],
-            "authors": [
-                {
-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                },
-                {
-                    "name": "Tobias Schultze",
-                    "homepage": "https://github.com/Tobion"
-                }
-            ],
-            "description": "PSR-7 message implementation that also provides common utility methods",
-            "keywords": [
-                "http",
-                "message",
-                "request",
-                "response",
-                "stream",
-                "uri",
-                "url"
-            ],
-            "time": "2017-03-20T17:10:46+00:00"
+            "abandoned": "guzzlehttp/guzzle",
+            "time": "2015-03-18T18:23:50+00:00"
         },
         {
             "name": "mailgun/mailgun-php",
-            "version": "2.3.4",
+            "version": "v1.7.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/mailgun/mailgun-php.git",
-                "reference": "f58c5914aefa16fa6ed2b5cf9ee84d40cbda1b3a"
+                "reference": "45ec0c8f3a2a6554b4987e97889f44991e4f75b4"
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-                "reference": "f58c5914aefa16fa6ed2b5cf9ee84d40cbda1b3a",
+                "url": "https://api.github.com/repos/mailgun/mailgun-php/zipball/45ec0c8f3a2a6554b4987e97889f44991e4f75b4",
+                "reference": "45ec0c8f3a2a6554b4987e97889f44991e4f75b4",
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-                "php-http/httplug": "^1.0",
-                "php-http/message": "^1.0",
-                "php-http/multipart-stream-builder": "^1.0",
-                "webmozart/assert": "^1.2"
+                "guzzle/guzzle": "<4.0,>=3.8"
             },
             "require-dev": {
-                "guzzlehttp/psr7": "^1.4",
-                "php-http/guzzle6-adapter": "^1.0",
-                "phpunit/phpunit": "~4.8"
+                "phpunit/phpunit": "3.7.*"
             },
             "type": "library",
             "autoload": {
                 "psr-0": {
+                    "Mailgun\\Tests": "tests/",
                     "Mailgun": "src/"
                 }
             },
@@ -516,76 +372,7 @@
                 }
             ],
             "description": "The Mailgun SDK provides methods for all API functions.",
-            "time": "2017-06-20T19:56:09+00:00"
-        },
-        {
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-            "version": "6.3.0.2",
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-                "url": "https://github.com/mike-koch/guzzle.git",
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-                "mike-koch/psr7": "1.4.2.1",
-                "php": ">=5.3"
-            },
-            "require-dev": {
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-                "phpunit/phpunit": "^4.0 || ^5.0",
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-            },
-            "suggest": {
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-            },
-            "type": "library",
-            "extra": {
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-                }
-            },
-            "autoload": {
-                "files": [
-                    "src/functions_include.php"
-                ],
-                "psr-4": {
-                    "GuzzleHttp\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                },
-                {
-                    "name": "Mike Koch",
-                    "homepage": "https://github.com/mike-koch"
-                }
-            ],
-            "description": "Guzzle is a PHP HTTP client library. Forked from guzzle/guzzle for 5.3 compatibility",
-            "homepage": "http://guzzlephp.org/",
-            "keywords": [
-                "client",
-                "curl",
-                "framework",
-                "http",
-                "http client",
-                "rest",
-                "web service"
-            ],
-            "time": "2017-11-07T13:15:47+00:00"
+            "time": "2014-11-19T22:31:03+00:00"
         },
         {
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@@ -635,126 +422,6 @@
             ],
             "time": "2017-09-08T02:23:09+00:00"
         },
-        {
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-            "version": "1.3.1.1",
-            "source": {
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-                "url": "https://github.com/mike-koch/promises.git",
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-            "autoload": {
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-                },
-                "files": [
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-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            ],
-            "authors": [
-                {
-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                },
-                {
-                    "name": "Mike Koch",
-                    "homepage": "https://github.com/mike-koch"
-                }
-            ],
-            "description": "Guzzle promises library, forked from guzzle/promises for PHP 5.3 compatibility",
-            "keywords": [
-                "promise"
-            ],
-            "time": "2017-11-07T13:07:15+00:00"
-        },
-        {
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-            "version": "1.4.2.1",
-            "source": {
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-                "url": "https://github.com/mike-koch/psr7.git",
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-                },
-                "files": [
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-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
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-            "authors": [
-                {
-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                },
-                {
-                    "name": "Tobias Schultze",
-                    "homepage": "https://github.com/Tobion"
-                }
-            ],
-            "description": "PSR-7 message implementation that also provides common utility methods",
-            "keywords": [
-                "http",
-                "message",
-                "request",
-                "response",
-                "stream",
-                "uri",
-                "url"
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-            "time": "2017-11-07T02:59:52+00:00"
-        },
         {
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             "version": "1.5.2",
@@ -898,103 +565,108 @@
             "time": "2014-08-21T08:20:45+00:00"
         },
         {
-            "name": "php-http/client-common",
-            "version": "v1.6.0",
+            "name": "phpmailer/phpmailer",
+            "version": "v5.2.26",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-http/client-common.git",
-                "reference": "1901ad36347227c14751a218d8f4ea1467d1f1ed"
+                "url": "https://github.com/PHPMailer/PHPMailer.git",
+                "reference": "70362997bda4376378be7d92d81e2200550923f7"
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-                "reference": "1901ad36347227c14751a218d8f4ea1467d1f1ed",
+                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/70362997bda4376378be7d92d81e2200550923f7",
+                "reference": "70362997bda4376378be7d92d81e2200550923f7",
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-                "php-http/httplug": "^1.1",
-                "php-http/message": "^1.6",
-                "php-http/message-factory": "^1.0",
-                "symfony/options-resolver": "^2.6 || ^3.0"
+                "ext-ctype": "*",
+                "php": ">=5.0.0"
             },
             "require-dev": {
-                "guzzlehttp/psr7": "^1.4",
-                "henrikbjorn/phpspec-code-coverage": "^1.0",
-                "phpspec/phpspec": "^2.4"
+                "doctrine/annotations": "1.2.*",
+                "jms/serializer": "0.16.*",
+                "phpdocumentor/phpdocumentor": "2.*",
+                "phpunit/phpunit": "4.8.*",
+                "symfony/debug": "2.8.*",
+                "symfony/filesystem": "2.8.*",
+                "symfony/translation": "2.8.*",
+                "symfony/yaml": "2.8.*",
+                "zendframework/zend-cache": "2.5.1",
+                "zendframework/zend-config": "2.5.1",
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-                    "email": "mark.sagikazar@gmail.com"
+                    "name": "Jim Jagielski",
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+                },
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+                    "email": "phpmailer@synchromedia.co.uk"
+                },
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+                    "email": "codeworxtech@users.sourceforge.net"
+                },
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-                "common",
-                "http",
-                "httplug"
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-            "time": "2017-10-16T16:16:36+00:00"
+            "description": "PHPMailer is a full-featured email creation and transfer class for PHP",
+            "time": "2017-11-04T09:26:05+00:00"
         },
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@@ -1003,56 +675,62 @@
             ],
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-            "description": "cURL client for PHP-HTTP",
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-                "http"
+                "PSR-11",
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-                "puli/composer-plugin": "Sets up Puli which is recommended for Discovery to work. Check http://docs.php-http.org/en/latest/discovery.html for more details."
+                "symfony/dependency-injection": "",
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@@ -1060,295 +738,251 @@
             ],
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-                "http",
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-                "psr7"
-            ],
-            "time": "2017-08-03T10:12:53+00:00"
+            "description": "Symfony EventDispatcher Component",
+            "homepage": "https://symfony.com",
+            "time": "2017-10-01T21:00:16+00:00"
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+            "name": "zendframework/zend-code",
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-                {
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-                }
+                "BSD-3-Clause"
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+            "description": "provides facilities to generate arbitrary code using an object oriented interface",
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-                "Guzzle",
-                "http"
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+            "time": "2013-05-15T18:04:27+00:00"
         },
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             "name": "myclabs/deep-copy",
@@ -2613,6 +1880,53 @@
             ],
             "time": "2017-08-03T14:08:16+00:00"
         },
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+                "url": "https://github.com/php-fig/log.git",
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+                    "dev-master": "1.0.x-dev"
+                }
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+            "autoload": {
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+                    "Psr\\Log\\": "Psr/Log/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for logging libraries",
+            "homepage": "https://github.com/php-fig/log",
+            "keywords": [
+                "log",
+                "psr",
+                "psr-3"
+            ],
+            "time": "2016-10-10T12:19:37+00:00"
+        },
         {
             "name": "sebastian/code-unit-reverse-lookup",
             "version": "1.0.1",
@@ -3172,6 +2486,183 @@
             "homepage": "https://github.com/sebastianbergmann/version",
             "time": "2016-10-03T07:35:21+00:00"
         },
+        {
+            "name": "symfony/console",
+            "version": "v2.8.28",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/console.git",
+                "reference": "f81549d2c5fdee8d711c9ab3c7e7362353ea5853"
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+                "symfony/debug": "^2.7.2|~3.0.0",
+                "symfony/polyfill-mbstring": "~1.0"
+            },
+            "require-dev": {
+                "psr/log": "~1.0",
+                "symfony/event-dispatcher": "~2.1|~3.0.0",
+                "symfony/process": "~2.1|~3.0.0"
+            },
+            "suggest": {
+                "psr/log": "For using the console logger",
+                "symfony/event-dispatcher": "",
+                "symfony/process": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Console\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Console Component",
+            "homepage": "https://symfony.com",
+            "time": "2017-10-01T21:00:16+00:00"
+        },
+        {
+            "name": "symfony/debug",
+            "version": "v3.0.9",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/debug.git",
+                "reference": "697c527acd9ea1b2d3efac34d9806bf255278b0a"
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5.9",
+                "psr/log": "~1.0"
+            },
+            "conflict": {
+                "symfony/http-kernel": ">=2.3,<2.3.24|~2.4.0|>=2.5,<2.5.9|>=2.6,<2.6.2"
+            },
+            "require-dev": {
+                "symfony/class-loader": "~2.8|~3.0",
+                "symfony/http-kernel": "~2.8|~3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Debug\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony Debug Component",
+            "homepage": "https://symfony.com",
+            "time": "2016-07-30T07:22:48+00:00"
+        },
+        {
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.6.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
+                "reference": "2ec8b39c38cb16674bbf3fea2b6ce5bf117e1296"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/2ec8b39c38cb16674bbf3fea2b6ce5bf117e1296",
+                "reference": "2ec8b39c38cb16674bbf3fea2b6ce5bf117e1296",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-mbstring": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.6-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Mbstring\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for the Mbstring extension",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "time": "2017-10-11T12:05:26+00:00"
+        },
         {
             "name": "theseer/tokenizer",
             "version": "1.1.0",
@@ -3211,6 +2702,56 @@
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
             "time": "2017-04-07T12:08:54+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2016-11-23T20:04:58+00:00"
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     ],
     "aliases": [],