Added three new tasks.

One task for generating the composer production autoloader, one
for linking shared files and folders into the release and
one to set filesystem acls while rolling out a new release.

Mage/Task/BuiltIn/Composer/GenerateAutoload.php

@@ -0,0 +1,40 @@
+<?php
+namespace Mage\Task\BuiltIn\Composer;
+
+use Exception;
+use Mage\Task\AbstractTask;
+use Mage\Task\ErrorWithMessageException;
+use Mage\Task\SkipException;
+
+class GenerateAutoload extends AbstractTask
+{
+    /**
+     * Returns the Title of the Task
+     * @return string
+     */
+    public function getName()
+    {
+        return 'Generating autoload files via composer [built-in]';
+    }
+
+    /**
+     * Runs the task
+     *
+     * @return boolean
+     * @throws Exception
+     * @throws ErrorWithMessageException
+     * @throws SkipException
+     */
+    public function run()
+    {
+        $releasesDirectory = $this->getConfig()->release('directory', 'releases');
+        $releasesDirectory = rtrim($this->getConfig()->deployment('to'), '/') . '/' . $releasesDirectory;
+        $currentCopy = $releasesDirectory . '/' . $this->getConfig()->getReleaseId();
+
+        $sharedFolderName = $this->getParameter('shared', 'shared');
+        $sharedFolderName = rtrim($this->getConfig()->deployment('to'), '/') . '/' . $sharedFolderName;
+
+        $composerPath = $this->getParameter('composer', "$sharedFolderName/composer.phar");
+        return $this->runCommandRemote("/usr/bin/env php $composerPath --working-dir=$currentCopy dumpautoload --optimize", $output);
+    }
+}