Rename DoctrineMigrate to DoctrineMigrateTask

I hope this is the reason it doesn't works.

Mage/Task/BuiltIn/Symfony2/DoctrineMigrateTask.php

@@ -0,0 +1,42 @@
+<?php
+/*
+* This file is part of the Magallanes package.
+*
+* (c) Andrés Montañez <andres@andresmontanez.com>
+*
+* For the full copyright and license information, please view the LICENSE
+* file that was distributed with this source code.
+*/
+
+namespace Mage\Task\BuiltIn\Symfony2;
+
+use Mage\Task\BuiltIn\Symfony2\SymfonyAbstractTask;
+
+/**
+ * Task for Doctrine migrations
+ */
+class DoctrineMigrateTask extends SymfonyAbstractTask
+{
+    /**
+     * (non-PHPdoc)
+     * @see \Mage\Task\AbstractTask::getName()
+     */
+    public function getName()
+    {
+        return 'Symfony v2 - Migrate doctrine entities [built-in]';
+    }
+
+    /**
+     * Migrates Doctrine entities
+     *
+     * @see \Mage\Task\AbstractTask::run()
+     */
+    public function run()
+    {
+        $env = $this->getParameter('env', 'dev');
+
+        $command = $this->getAppPath() . ' doctrine:migrations:migrate -n --env=' . $env;
+        
+        return $this->runCommand($command);
+    }
+}