Added "ordergroups" view to list the ordergroups

* You can search in the name.
* You can show only active order groups (order in last 3 months)
* Future feature: generate text and pdf files for the box
  labels

app/views/foodcoop/ordergroups.html.haml

@@ -5,17 +5,18 @@
     %h2 Übersicht
   .column_content
     #user_filter{:style => "margin-right:2em;"}
-      %form{:name=>"sform", :action=>"", :style=>"display:inline;"}
+      %form{:id=>"sform", :action=>"", :style=>"display:inline;"}
         %label{:for => 'article_name'} Suche nach Name:
         = text_field_tag("query", params['query'], :size => 10 )
+        %label{:for => 'only_active'} Nur aktive:
+        = check_box_tag('only_active')
 
-      = observe_field 'query',  :frequency => 2, |
-        :before => "Element.show('loader')", |
-        :success => "Element.hide('loader')", |
-        :url => {:action => 'ordergroups'}, |
-        :update => :order_groups, |
-        :with => 'query', |
-        :method => :get |
+        = observe_form 'sform', :frequency => 2, |
+          :before => "Element.show('loader')", |
+          :success => "Element.hide('loader')", |
+          :url => {:action => 'ordergroups'}, |
+          :update => :order_groups, |
+          :method => :get |
     
     #order_groups
       = render :partial => "ordergroups"