* add clear_cache.php bin command

system/bin/clear_cache.php

@@ -0,0 +1,18 @@
+<?php
+
+if(PHP_SAPI !== 'cli') {
+	die('This script can be run only in command line mode.');
+}
+
+require_once __DIR__ . '/../../common.php';
+require_once SYSTEM . 'functions.php';
+require_once SYSTEM . 'init.php';
+
+if(clearCache()) {
+	echo 'Cache cleared.';
+}
+else {
+	echo 'Unexpected error.';
+}
+
+echo PHP_EOL;