Issue #20 Read stderr before stdout to avoid hanging processes

Author: mikehaertl

Diff for: src/Command.php

@@ -315,8 +315,9 @@ public function execute()
 
             if (is_resource($process)) {
 
-                $this->_stdOut = stream_get_contents($pipes[1]);
+                // Issue #20: Read stderr before stdout to avoid hanging processes
                 $this->_stdErr = stream_get_contents($pipes[2]);
+                $this->_stdOut = stream_get_contents($pipes[1]);
                 fclose($pipes[1]);
                 fclose($pipes[2]);