Error handling / rename / ordered queries

1. error handling for all routes & models function
2. rename scripts -> queries
3. use [][2]string instead of map[string]string to provide ordered
   queries list

templates/layouts/queries.html

@@ -0,0 +1,8 @@
+{{ define "queries" }}
+<h3>快速查詢</h3>
+<ul>
+    {{ range . }}
+    <li><a href="/query?query={{ index . 1 | urlquery  }}">{{ index . 0 }}</a></li>
+    {{ end }}
+</ul>
+{{ end }}