QABot Data Model + Documentation + Dashboard Layout

[leandrosardi]

By now, we are going to manage 3 kinds of alerts:

1. boolean green/red flags;
2. integer green/red flags with thresholds;
3. float green/red flags with thresholds;

Also,

1. each alerts must be belonging a cathergory;
2. I should be able to see the timeline of each alert;
3. it should deliver an email if an alert go red;
4. each alert may be public(in the web) or private (requires login).

Also,

1. show an alert if the flag has not been updated recently because of a failure of the bot.