版本重构，加web管理方式

views/public/error.html

@@ -0,0 +1,5 @@
+<div class="page-error tile">
+    <h1><i class="fa fa-exclamation-circle"></i> Error 404: Page not found</h1>
+    <p>The page you have requested is not found.</p>
+    <p><a class="btn btn-primary" href="javascript:window.history.back();">Go Back</a></p>
+</div>