Cronjob to send email of all notifications

[GraemeFulton]

could work like this:

• at the end of the day/week , a funciton that queries notifications table by unread
• then group the notifications based on type:
  • (e.g. x people liked y), you got a creator badge ...
  • this person who you follow, just published this post
• send as a weekly roundup
• mark notification as email sent
• following week, repeat but exclude notificaitons with emailSent==true so if the user doesn't open the notifaction, it doesn't send again
• if no new notifications, don't send email