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/dashboard.html

@@ -12,5 +12,5 @@
     <label>名稱：<input name="name" type="text"></label></br>
     <input type="submit" value="新增記錄">
 </form>
-{{ template "scripts" .Scripts }}
+{{ template "queries" .Queries }}
 {{ end }}