add metadata field to channels

app/views/channels/_edit.html.erb

@@ -29,6 +29,10 @@
         <td class="left"><%= t(:channel_description) %></td>
         <td><%= c.text_area :description, :cols => 30, :rows => 4 %></td>
       </tr>
+      <tr>
+        <td class="left"><%= t(:metadata).capitalize %></td>
+        <td><%= c.text_area :metadata, :cols => 30, :rows => 4 %></td>
+      </tr>
       <%= fields_for :tags do |t| %>
         <tr>
           <td class="left"><%= t(:tags) %></td>