Added utility to nuke the templating cache directory.

tools/nuke-tpl-cache

@@ -0,0 +1,17 @@
+#!/usr/bin/env php
+<?php
+namespace Misuzu;
+
+require_once __DIR__ . '/../misuzu.php';
+
+$path = $msz->tplCtx->cachePath;
+if(empty($path))
+    die(sprintf('No cache path is specified.%s', PHP_EOL));
+
+if(!is_dir($path))
+    die(sprintf('Cache directory does not exist.%s', PHP_EOL));
+
+if(fileowner($path) !== posix_getuid())
+    die(sprintf('Script must be run as the owner of the cache directory.%s', PHP_EOL));
+
+echo `rm -rv {$path}`;