Develop

Fixes #24.

1. Added `Retask, Redis` to `requirements.txt`.
2. Added `Retask settings` to `settings-sample.py`.
3. Added `send_notification.py` file.
4. Currently when user changes `profile, adds new team, edits team` notification is sent to required `client app`.
5. `send_notification.py` uses timer of 60 seconds.
6. We need to `dameonize` `send_notification.py`,  will we use `nohup` ?