Add informacie-notifications collection.

Note: requires ensure_indices to be run.
Merge remote branch 'origin/master' into informacie
Created informacie-digest mail template and cron
Add utils/cron/send-informacie-digest.py
Merge remote branch 'origin/master' into informacie
Added reminder functionality for adding groups and users.
Finished informacie digest email template
Merge pull request #158 from khandhas-infra/informacie

Informacie