fix decorate calls on collections after draper update

app/decorators/application_decorator.rb

@@ -1,27 +1,28 @@
-class ApplicationDecorator < Draper::Base
+class ApplicationDecorator < Draper::Decorator
+  delegate_all
   # Lazy Helpers
   #   PRO: Call Rails helpers without the h. proxy
   #        ex: number_to_currency(model.price)
   #   CON: Add a bazillion methods into your decorator's namespace
   #        and probably sacrifice performance/memory
-  #  
+  #
   #   Enable them by uncommenting this line:
   #   lazy_helpers
 
   # Shared Decorations
   #   Consider defining shared methods common to all your models.
-  #   
+  #
   #   Example: standardize the formatting of timestamps
   #
   #   def formatted_timestamp(time)
-  #     h.content_tag :span, time.strftime("%a %m/%d/%y"), 
-  #                   class: 'timestamp' 
+  #     h.content_tag :span, time.strftime("%a %m/%d/%y"),
+  #                   class: 'timestamp'
   #   end
-  # 
+  #
   #   def created_at
   #     formatted_timestamp(model.created_at)
   #   end
-  # 
+  #
   #   def updated_at
   #     formatted_timestamp(model.updated_at)
   #   end