add super manager to edit and delete lessons and comments
Update db/migrate/20120827042711_create_lessonplans.rb
Update db/migrate/20120828223540_create_ckeditor_assets.rb
Update db/migrate/20120830091618_create_tasks.rb
Update db/migrate/20120910102229_create_users.rb
Update db/migrate/20120912113603_create_comments.rb
Update db/migrate/20121213010030_create_publishers.rb
Update db/migrate/20121231125320_create_simple_captcha_data.rb
fix the error when not login