Fix menu_item_spec to run standalone.
Fix menu_item_spec to run standalone.

deivid-rodriguez/activeadmin,javierjulio/activeadmin,activeadmin/activeadmin,siutin/activeadmin,vraravam/activeadmin,mauriciopasquier/active_admin,javierjulio/activeadmin,activeadmin/activeadmin,activeadmin/activeadmin,mrjman/activeadmin,mrjman/activeadmin,vraravam/activeadmin,siutin/activeadmin,mrjman/activeadmin,deivid-rodriguez/activeadmin,siutin/activeadmin,vraravam/activeadmin,javierjulio/activeadmin,mauriciopasquier/active_admin,deivid-rodriguez/activeadmin,mauriciopasquier/active_admin