Renamed tests/tests to tests/test_data

When looking at your folder structure, it is easier to grasp that the .md and .html files are just your data for the tests

tests/index.php

@@ -6,7 +6,7 @@ $page = $_SERVER['QUERY_STRING']
 	? 'test'
 	: 'index';
 
-$dir = 'tests/';
+$dir = 'test_data/';
 
 include $page.'_controller.php';
-include $page.'_view.php';
+include $page.'_view.php';