fix 新聞與公告QA

1.優先處理-快速編輯中的檔案上傳無法新增，但可刪除
	2.優先處理-編輯中的檔案列表，無法刪除
	3.優先處理-刪除時應彈出警告視窗，請user確認一次，再將檔案刪除

vendor/built_in_modules/announcement/app/views/panel/announcement/back_end/bulletins/_form_bulletin_file.html.erb

@@ -63,6 +63,7 @@
 			  <a class="delete"><i class="icon-remove"></i></a>
 			<% else %>	
 			  <%= f.hidden_field :id %>
+			  <%= hidden_field_tag :tr, (dom_id form_bulletin_file) %>
 			  <a class="remove_existing_record"><i class="icon-remove"></i></a>
 			  <%= f.hidden_field :should_destroy, :value => nil, :class => 'should_destroy' %>
 			<% end %>

vendor/built_in_modules/announcement/app/views/panel/announcement/back_end/bulletins/index.html.erb

@@ -18,6 +18,12 @@
 	</div>
 </div>
 
+<div id="news_bulletin_file_qe">
+	<div id="modal-file" class="modal fade">
+		<%= render :partial => "bulletin_file_qe" %>
+	</div>
+</div>
+
 <% content_for :page_specific_javascript do %>
 	<%= javascript_include_tag "bulletin_form" %>
 	<%= javascript_include_tag "/static/jquery.cycle.all.latest.js" %>