Revert "Make PHPUnit bootstrap add flush=1"

This reverts commit e003796.

Conflicts:

	tests/travis/_ss_environment.php

tests/bootstrap.php

@@ -20,7 +20,6 @@
 $frameworkPath = dirname(dirname(__FILE__));
 $frameworkDir = basename($frameworkPath);
 
-$_GET['flush'] = 1;
 $_SERVER['SCRIPT_FILENAME'] = $frameworkPath . DIRECTORY_SEPARATOR . 'cli-script.php';
 $_SERVER['SCRIPT_NAME'] = '.' . DIRECTORY_SEPARATOR . $frameworkDir . DIRECTORY_SEPARATOR . 'cli-script.php'; 
 
@@ -71,4 +70,4 @@
 		"Add flush=1 as an argument to discover new classes or files.\n",
 		false
 	);
-}
+}