fixes #250

app/views/dmails/_form.html.erb

@@ -1,6 +1,6 @@
 <%= simple_form_for(dmail) do |f| %>
   <%= f.input :to_name, :label => "To" %>
-  <%= f.input :title %>
+  <%= f.input :title, :as => :string %>
   <%= dtext_field "dmail", "body" %>
   <%= f.button :submit, "Send" %>
   <%= dtext_preview_button "dmail", "body" %>

app/views/dmails/index.html.erb

@@ -13,7 +13,7 @@
       </thead>
       <tbody>
         <% @dmails.each do |dmail| %>
-          <tr>
+          <tr class="read-<%= dmail.is_read? %>">
             <td><%= compact_time(dmail.created_at) %></td>
             <td><%= link_to dmail.from_name, user_path(dmail.from) %></td>
             <td><%= link_to dmail.to_name, user_path(dmail.to) %></td>