Hackathon

[CedricCabessa]

This branch assemble the work from the last hackathon:

• More speed
• A backend

Sorry, @caarmen with the refacto of HTTP request to speed up things, I could'nt easily merge your work. I'll probably do it later. Anyway this branch is a good basis but need some work to have something mergeable. Some of known issues:

• slackbot is broken
• backend schema is too complicated, which make admin page difficult to use
• some database ugliness have leaked in the HTTP request engine

[sgaland]

slackbot is broken ? :x:

[CedricCabessa]

I think we can kill this now