Custom stream wrapper support

Added support for custom stream wrappers, such as "fly" or "s3".
Support is determined per reader.

tests/bootstrap.php

@@ -3,6 +3,7 @@ require_once(dirname(__DIR__) . '/vendor/autoload.php');
 
 require_once(dirname(__DIR__) . '/tests/Spout/TestUsingResource.php');
 require_once(dirname(__DIR__) . '/tests/Spout/ReflectionHelper.php');
+require_once(dirname(__DIR__) . '/tests/Spout/Reader/CSV/SpoutTestStream.php');
 
 // Make sure a timezone is set to be able to work with dates
 date_default_timezone_set('UTC');