Second part of stock-integration.

Introduced StockArticle and a special page for ordering from stock. StockChanges will be created and the StockArticle.quantity
updated in 'order.close!'.

app/views/deliveries/new.html.haml

@@ -1,4 +1,27 @@
 - title "Neue Lieferung von #{@supplier.name}"
 
-- render :layout => 'form' do
-  = render :partial => 'stock_change', :collection => @delivery.stock_changes
+.left_column
+  - form_for([@supplier,@delivery]) do |f|
+    .box_title
+      %h2 Lieferung anlegen
+    .column_content
+      = f.error_messages
+      = f.hidden_field :supplier_id
+      %p
+        %b= f.label :delivered_on
+        = f.date_select :delivered_on
+      %h2 Lagerartikel des Lieferanten
+      #stock_changes
+      = render :partial => 'stock_change', :collection => @delivery.stock_changes
+      %p
+        = f.submit "Lieferung anlegen"
+
+.right_column{:style => "width:35em;"}
+  .box_title
+    %h2 Neuen Lagerartikel anlegen
+  .column_content
+    #new_stock_article
+      = render :partial => 'new_stock_article', :locals => {:stock_article => @supplier.stock_articles.build}
+  
+%p{:style => "clear:both"}
+  = link_to 'Zurück', supplier_deliveries_path(@supplier)