Issue mikehaertl#6 Modified proc_open() pipe setup on Windows

Author: mikehaertl

src/Command.php

@@ -283,7 +283,7 @@ public function execute()
         } else {
             $descriptors = array(
                 1   => array('pipe','w'),
-                2   => array('pipe','w'),
+                2   => array('pipe', $this->getIsWindows() ? 'a' : 'w'),
             );
             $process = proc_open($command, $descriptors, $pipes, $this->procCwd, $this->procEnv, $this->procOptions);
 
@@ -311,6 +311,14 @@ public function execute()
         return true;
     }
 
+    /**
+     * @return bool whether we are on a Windows OS
+     */
+    public function getIsWindows()
+    {
+        return strncasecmp(PHP_OS, 'WIN', 3)===0;
+    }
+
     /**
      * @return string the current command string to execute
      */