allow the main app to add custom code in the locomotive layout

app/cells/locomotive/sub_menu_cell.rb

@@ -5,7 +5,7 @@ module Locomotive
 
     def build_item(name, attributes)
       item = super
-      enhanced_class = "#{'on' if name.to_s == sections(:sub)} #{item[:class]}"
+      enhanced_class = "#{'on' if name.to_s == sections(:sub).to_s} #{item[:class]}"
       item.merge(:class => enhanced_class)
     end
 

app/views/locomotive/shared/_head.html.haml

@@ -29,4 +29,6 @@
 
     });
 
-= yield :head
+= yield :head
+
+= render 'locomotive/shared/main_app_head'

app/views/locomotive/shared/_main_app_head.html.haml

@@ -0,0 +1 @@
+- # this partial can be overridden in the main app in order to include extra css or js