added some helper methods to content_types liquid drops (via @KarlBright)

lib/locomotive/liquid/drops/contents.rb

@@ -29,6 +29,18 @@ module Locomotive
           self.collection.each(&block)
         end
         
+        def size
+          self.collection.size
+        end
+       
+        def empty?
+          self.collection.empty?
+        end
+       
+        def any?
+          self.collection.any?
+        end
+
         def api
           { 'create' => @context.registers[:controller].send('admin_api_contents_url', @content_type.slug) }
         end