[bd] Keyword Alert
Keep track of important matters.
1. Setup email notification for keywords and posters
2. 4 delivery mode: immediately, daily, weekly, monthly
2. User-group permissions to use the feature
3. Cron processing to reduce server load and number of email.
1. Upload files and directories inside `upload` to XenForo's root directory. Select "Merge" for everything if you are asked
2. Import the .xml file using XenForo add-on importer
3. Configure user-group permission [Keyword Alert] Can use
4. Test creating new alert by going to http://domain.com/xenforo/account/keyword-alert (please note that email won't be sent out until the cron job runs, even for immediate delivery)