Use rhumsaa/uuid instead of custom uuid implementation

composer.lock

@@ -3,7 +3,7 @@
         "This file locks the dependencies of your project to a known state",
         "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file"
     ],
-    "hash": "86007d19092732cf77a4dab27e072a2b",
+    "hash": "0d8e038306a0c58deac6187e6a607e71",
     "packages": [
         {
             "name": "alchemy-fr/tcpdf-clone",
@@ -3220,6 +3220,71 @@
             ],
             "time": "2013-09-18 11:02:06"
         },
+        {
+            "name": "rhumsaa/uuid",
+            "version": "2.7.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ramsey/uuid.git",
+                "reference": "8569983a11ed96087cdf94c7aa65866138681beb"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ramsey/uuid/zipball/8569983a11ed96087cdf94c7aa65866138681beb",
+                "reference": "8569983a11ed96087cdf94c7aa65866138681beb",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "require-dev": {
+                "doctrine/dbal": ">=2.3",
+                "moontoast/math": "~1.1",
+                "phpunit/phpunit": "~3.7",
+                "symfony/console": "~2.3"
+            },
+            "suggest": {
+                "doctrine/dbal": "Allow the use of a UUID as doctrine field type.",
+                "moontoast/math": "Support for converting UUID to 128-bit integer (in string form).",
+                "symfony/console": "Support for use of the bin/uuid command line tool."
+            },
+            "bin": [
+                "bin/uuid"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.7.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-0": {
+                    "Rhumsaa\\Uuid": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marijn Huizendveld",
+                    "email": "marijn.huizendveld@gmail.com"
+                },
+                {
+                    "name": "Ben Ramsey",
+                    "homepage": "http://benramsey.com"
+                }
+            ],
+            "description": "A PHP 5.3+ library for generating RFC 4122 version 1, 3, 4, and 5 universally unique identifiers (UUID).",
+            "homepage": "https://github.com/ramsey/uuid",
+            "keywords": [
+                "guid",
+                "identifier",
+                "uuid"
+            ],
+            "time": "2014-02-22 00:08:43"
+        },
         {
             "name": "silex/silex",
             "version": "1.1.x-dev",