Include composer dependencies in repo

vendor/fguillot/simpleLogger/src/SimpleLogger/Stderr.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace SimpleLogger;
+
+/**
+ * Stderr logger
+ *
+ * @package SimpleLogger
+ * @author  Frédéric Guillot
+ */
+class Stderr extends Base
+{
+    /**
+     * Logs with an arbitrary level.
+     *
+     * @param mixed  $level
+     * @param string $message
+     * @param array  $context
+     * @return null
+     */
+    public function log($level, $message, array $context = array())
+    {
+        file_put_contents('php://stderr', $this->formatMessage($level, $message, $context), FILE_APPEND);
+    }
+}