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diff --git a/vendor/symfony/console/Symfony/Component/Console/Shell.php b/vendor/symfony/console/Symfony/Component/Console/Shell.php
new file mode 100644
index 0000000..2dc51b6
--- /dev/null
+++ b/vendor/symfony/console/Symfony/Component/Console/Shell.php
@@ -0,0 +1,207 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Console;
+
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Input\StringInput;
+use Symfony\Component\Console\Output\ConsoleOutput;
+use Symfony\Component\Process\ProcessBuilder;
+use Symfony\Component\Process\PhpExecutableFinder;
+
+/**
+ * A Shell wraps an Application to add shell capabilities to it.
+ *
+ * Support for history and completion only works with a PHP compiled
+ * with readline support (either --with-readline or --with-libedit)
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class Shell
+{
+    private $application;
+    private $history;
+    private $output;
+    private $hasReadline;
+    private $prompt;
+    private $processIsolation;
+
+    /**
+     * Constructor.
+     *
+     * If there is no readline support for the current PHP executable
+     * a \RuntimeException exception is thrown.
+     *
+     * @param Application $application An application instance
+     */
+    public function __construct(Application $application)
+    {
+        $this->hasReadline = function_exists('readline');
+        $this->application = $application;
+        $this->history = getenv('HOME').'/.history_'.$application->getName();
+        $this->output = new ConsoleOutput();
+        $this->prompt = $application->getName().' > ';
+        $this->processIsolation = false;
+    }
+
+    /**
+     * Runs the shell.
+     */
+    public function run()
+    {
+        $this->application->setAutoExit(false);
+        $this->application->setCatchExceptions(true);
+
+        if ($this->hasReadline) {
+            readline_read_history($this->history);
+            readline_completion_function(array($this, 'autocompleter'));
+        }
+
+        $this->output->writeln($this->getHeader());
+        $php = null;
+        if ($this->processIsolation) {
+            $finder = new PhpExecutableFinder();
+            $php = $finder->find();
+            $this->output->writeln(<<<EOF
+<info>Running with process isolation, you should consider this:</info>
+  * each command is executed as separate process,
+  * commands don't support interactivity, all params must be passed explicitly,
+  * commands output is not colorized.
+
+EOF
+            );
+        }
+
+        while (true) {
+            $command = $this->readline();
+
+            if (false === $command) {
+                $this->output->writeln("\n");
+
+                break;
+            }
+
+            if ($this->hasReadline) {
+                readline_add_history($command);
+                readline_write_history($this->history);
+            }
+
+            if ($this->processIsolation) {
+                $pb = new ProcessBuilder();
+
+                $process = $pb
+                    ->add($php)
+                    ->add($_SERVER['argv'][0])
+                    ->add($command)
+                    ->inheritEnvironmentVariables(true)
+                    ->getProcess()
+                ;
+
+                $output = $this->output;
+                $process->run(function($type, $data) use ($output) {
+                    $output->writeln($data);
+                });
+
+                $ret = $process->getExitCode();
+            } else {
+                $ret = $this->application->run(new StringInput($command), $this->output);
+            }
+
+            if (0 !== $ret) {
+                $this->output->writeln(sprintf('<error>The command terminated with an error status (%s)</error>', $ret));
+            }
+        }
+    }
+
+    /**
+     * Returns the shell header.
+     *
+     * @return string The header string
+     */
+    protected function getHeader()
+    {
+        return <<<EOF
+
+Welcome to the <info>{$this->application->getName()}</info> shell (<comment>{$this->application->getVersion()}</comment>).
+
+At the prompt, type <comment>help</comment> for some help,
+or <comment>list</comment> to get a list of available commands.
+
+To exit the shell, type <comment>^D</comment>.
+
+EOF;
+    }
+
+    /**
+     * Tries to return autocompletion for the current entered text.
+     *
+     * @param string $text The last segment of the entered text
+     *
+     * @return Boolean|array A list of guessed strings or true
+     */
+    private function autocompleter($text)
+    {
+        $info = readline_info();
+        $text = substr($info['line_buffer'], 0, $info['end']);
+
+        if ($info['point'] !== $info['end']) {
+            return true;
+        }
+
+        // task name?
+        if (false === strpos($text, ' ') || !$text) {
+            return array_keys($this->application->all());
+        }
+
+        // options and arguments?
+        try {
+            $command = $this->application->find(substr($text, 0, strpos($text, ' ')));
+        } catch (\Exception $e) {
+            return true;
+        }
+
+        $list = array('--help');
+        foreach ($command->getDefinition()->getOptions() as $option) {
+            $list[] = '--'.$option->getName();
+        }
+
+        return $list;
+    }
+
+    /**
+     * Reads a single line from standard input.
+     *
+     * @return string The single line from standard input
+     */
+    private function readline()
+    {
+        if ($this->hasReadline) {
+            $line = readline($this->prompt);
+        } else {
+            $this->output->write($this->prompt);
+            $line = fgets(STDIN, 1024);
+            $line = (!$line && strlen($line) == 0) ? false : rtrim($line);
+        }
+
+        return $line;
+    }
+
+    public function getProcessIsolation()
+    {
+        return $this->processIsolation;
+    }
+
+    public function setProcessIsolation($processIsolation)
+    {
+        $this->processIsolation = (Boolean) $processIsolation;
+    }
+}