Project directories restructured

New paradigm:

Backend sources live in /backend
Frontend scripts' sources live in /frontend/scripts
Frontend styles' sources live in /frontend/styles

Everything compiled goes to /build, where above structure is preserved.

Quite simple :)
Improved serve response middleware
Extend data with csrf and participant before serve
Home page (/) reactivated

Not much to see there yet :P
Connect to mongo
Story model and Journal plugin

also moved FindOrCreate functionality to separate plugin.