make changeset instance and start on change page

app/helpers/merged/changes_helper.rb

@@ -6,5 +6,19 @@ module Merged
       return true if name.include?("merged/")
       false
     end
+
+    def changeset( type , element)
+      case type
+      when :add
+        ChangeSet.current.added( element )
+      when :edit
+        ChangeSet.current.edited( element )
+      when :delete
+        ChangeSet.current.deleted( element )
+      else
+        raise "unrecognized type #{type}"
+      end
+    end
+
   end
 end