[#4420] Add the frequency field for Retainers to the Model and View.

app/views/deliverables/_form.html.erb

@@ -2,7 +2,12 @@
 <% form.inputs :name => l(:text_deliverable_details_legend) do %>
   <%= form.input :title, :required => true %>
   <% if resource.new_record? %>
-    <%= form.input(:type, :required => true, :as => :select, :collection => [["Fixed", "FixedDeliverable"],["Hourly", "HourlyDeliverable"]], :include_blank => false, :input_html => {:class => 'type'}) %>
+    <li class="select required" id="deliverable_type_input">
+      <%= form.label(:type, l(:field_type)) %>
+      <%= form.select(:type, [["Fixed", "FixedDeliverable"], ["Hourly", "HourlyDeliverable"], ["Retainer", "RetainerDeliverable"]], {:include_blank => false}, {:class => 'type'}) %>
+
+      <%= form.select(:frequency, RetainerDeliverable.frequencies_to_select, :include_blank => false) %>
+    </li>
   <% else %>
     <%= form.input :type, :as => :hidden, :class => 'type' %>
   <% end %>