Merge branch 'dev_aliyun' of http://bdgit.educoder.net/Hjqreturn/educoder into dev_aliyun

app/views/admins/shixuns/shared/_list.html.erb

@@ -9,7 +9,7 @@
   <th width="5%">选择</th>
   <th width="6%">状态</th>
   <th width="7%">创建者</th>
-  <th class="eud-pointer" width="13%"><%= sort_tag('创建于', name: 'created_at', path: admins_shixuns_path) %></th>
+  <th width="13%"><%= sort_tag('创建于', name: 'created_on', path: admins_shixuns_path) %></th>
   <th width="5%">单测</th>
   <th width="6%">操作</th>
   </thead>