Sessions

[marcelomiky]

Create a session to use in a specific group of people. The bot send an code to validate that session and anyone who wants to send a question to that session uses that code.

After some hours in inactivity, the bot kills the session.

[zsinx6]

Since the bot is hosted currently on heroku, the session only exists for 30 minutes without activity. So to better handle the time and isolate each session, we'll use persistence of all sessions.
Also, the bot will still work without a session, having then 2 modes: with a session and sending random questions without a session