Not escape on windows

Fixes #27

Author: barryvdh

src/AsyncQueue.php

@@ -99,6 +99,10 @@ protected function getCommand($jobId, $delay = 0)
     protected function getPhpBinary()
     {
         $path = escapeshellarg($this->config['binary']);
+        if (!defined('PHP_WINDOWS_VERSION_BUILD')) {
+            $path = escapeshellarg($path);
+        }
+
         $args = $this->config['binary_args'];
         if(is_array($args)){
             $args = implode(' ', $args);