Adding payment stats

app/views/payments/index.html.erb

@@ -7,6 +7,15 @@
 <%= link_to 'IPN', ipns_path %>
 </p>
 
+<p>
+<h3>Payments by Month</h3>
+<dl>
+<% @payments_by_month.each do |month| %>
+  <dt><%= month[:month] %></dt>
+  <dd><%= month[:sum] %></dd>
+<% end %>
+</dl>
+
 <table>
   <tr>
     <th>Payee</th>