diff --git a/.travis.yml b/.travis.yml
index 96a0f19c..691877f3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,4 +14,4 @@ before_script:
   - wget -nc http://getcomposer.org/composer.phar
   - php composer.phar install
 
-script: phpunit --configuration phpunit.xml.dist
+script: vendor/bin/phpunit --configuration phpunit.xml.dist
diff --git a/composer.json b/composer.json
index 1a5e93b5..d7b5e869 100644
--- a/composer.json
+++ b/composer.json
@@ -15,13 +15,22 @@
         }
     ],
     "license": "BSD-3-Clause",
+    "config": {
+        "platform": {
+            "php": "5.3.9"
+        }
+    },
     "require": {
         "php": ">=5.3.0"
     },
+    "require-dev": {
+        "phpunit/phpunit": "4.8.35",
+        "symfony/yaml": "2.8.22"
+    },
     "autoload": {
         "psr-4": {
             "Firebase\\JWT\\": "src"
         }
     },
-    "minimum-stability": "dev"
+    "minimum-stability": "stable"
 }
diff --git a/composer.lock b/composer.lock
index 5518ae41..2abce1f4 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,16 +4,983 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "60a5df5d283a7ae9000173248eba8909",
+    "content-hash": "47a4b9d68f73f2f11853e4a2cdf20a70",
     "packages": [],
-    "packages-dev": [],
+    "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/8e884e78f9f0eb1329e445619e04456e64d8051d",
+                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3,<8.0-DEV"
+            },
+            "require-dev": {
+                "athletic/athletic": "~0.1.8",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpunit/phpunit": "~4.0",
+                "squizlabs/php_codesniffer": "~2.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "http://ocramius.github.com/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://github.com/doctrine/instantiator",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "time": "2015-06-14T21:17:01+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-docblock",
+            "version": "2.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
+                "reference": "e6a969a640b00d8daa3c66518b0405fb41ae0c4b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/e6a969a640b00d8daa3c66518b0405fb41ae0c4b",
+                "reference": "e6a969a640b00d8daa3c66518b0405fb41ae0c4b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.0"
+            },
+            "suggest": {
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+                "erusev/parsedown": "~1.0"
+            },
+            "type": "library",
+            "extra": {
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+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "phpDocumentor": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "mike.vanriel@naenius.com"
+                }
+            ],
+            "time": "2016-01-25T08:17:30+00:00"
+        },
+        {
+            "name": "phpspec/prophecy",
+            "version": "v1.7.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpspec/prophecy.git",
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/93d39f1f7f9326d746203c7c056f300f7f126073",
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
+                "shasum": ""
+            },
+            "require": {
+                "doctrine/instantiator": "^1.0.2",
+                "php": "^5.3|^7.0",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
+                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
+            },
+            "require-dev": {
+                "phpspec/phpspec": "^2.5|^3.2",
+                "phpunit/phpunit": "^4.8 || ^5.6.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.6.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Prophecy\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Konstantin Kudryashov",
+                    "email": "ever.zet@gmail.com",
+                    "homepage": "http://everzet.com"
+                },
+                {
+                    "name": "Marcello Duarte",
+                    "email": "marcello.duarte@gmail.com"
+                }
+            ],
+            "description": "Highly opinionated mocking framework for PHP 5.3+",
+            "homepage": "https://github.com/phpspec/prophecy",
+            "keywords": [
+                "Double",
+                "Dummy",
+                "fake",
+                "mock",
+                "spy",
+                "stub"
+            ],
+            "time": "2017-03-02T20:05:34+00:00"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "2.2.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979"
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+                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3",
+                "phpunit/php-file-iterator": "~1.3",
+                "phpunit/php-text-template": "~1.2",
+                "phpunit/php-token-stream": "~1.3",
+                "sebastian/environment": "^1.3.2",
+                "sebastian/version": "~1.0"
+            },
+            "require-dev": {
+                "ext-xdebug": ">=2.1.4",
+                "phpunit/phpunit": "~4"
+            },
+            "suggest": {
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+                "ext-xmlwriter": "*"
+            },
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+                    "dev-master": "2.2.x-dev"
+                }
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+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
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+        },
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+            "version": "1.4.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5"
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+                "reference": "3cc8f69b3028d0f96a9078e6295d86e9bf019be5",
+                "shasum": ""
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+                    "name": "Sebastian Bergmann",
+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
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+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "time": "2016-10-03T07:40:28+00:00"
+        },
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+            "version": "1.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
+                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686"
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
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+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "keywords": [
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+            "time": "2015-06-21T13:50:34+00:00"
+        },
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+            "version": "1.0.9",
+            "source": {
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+            },
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+            "license": [
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+                    "email": "sb@sebastian-bergmann.de",
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+            "homepage": "https://github.com/sebastianbergmann/php-timer/",
+            "keywords": [
+                "timer"
+            ],
+            "time": "2017-02-26T11:10:40+00:00"
+        },
+        {
+            "name": "phpunit/php-token-stream",
+            "version": "1.4.11",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-token-stream.git",
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7"
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+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7",
+                "shasum": ""
+            },
+            "require": {
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+                "php": ">=5.3.3"
+            },
+            "require-dev": {
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+            "type": "library",
+            "extra": {
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            "authors": [
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+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Wrapper around PHP's tokenizer extension.",
+            "homepage": "https://github.com/sebastianbergmann/php-token-stream/",
+            "keywords": [
+                "tokenizer"
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+            "time": "2017-02-27T10:12:30+00:00"
+        },
+        {
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+            "version": "4.8.35",
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+                "phpunit/php-file-iterator": "~1.4",
+                "phpunit/php-text-template": "~1.2",
+                "phpunit/php-timer": "^1.0.6",
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+                "sebastian/comparator": "~1.2.2",
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+                "sebastian/exporter": "~1.2",
+                "sebastian/global-state": "~1.0",
+                "sebastian/version": "~1.0",
+                "symfony/yaml": "~2.1|~3.0"
+            },
+            "suggest": {
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+            },
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+            ],
+            "type": "library",
+            "extra": {
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+            "notification-url": "https://packagist.org/downloads/",
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+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+                    "name": "Sebastian Bergmann",
+                    "email": "sb@sebastian-bergmann.de",
+                    "role": "lead"
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+            "description": "Mock Object library for PHPUnit",
+            "homepage": "https://github.com/sebastianbergmann/phpunit-mock-objects/",
+            "keywords": [
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+                "shasum": ""
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+            "extra": {
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Volker Dusch",
+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@2bepublished.at"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides the functionality to compare PHP values for equality",
+            "homepage": "http://www.github.com/sebastianbergmann/comparator",
+            "keywords": [
+                "comparator",
+                "compare",
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