Scaffold Slots

wauuu
Create people files

not sure where those come from
Switch to mysql2
Correct day attribute to day_id
Fix attributes

Atrributes are foreign keys now
Add current to routes

days/current now now leads to the show view of the last day
Add index view for days
Fix acceptance tests
Create rake task for the creation of day

NB the date is hardcoded into the rake task, i.e. has to be changed manually