Add autofill of the slug and check that it is valid
Add autofill of the slug and check that it is valid

mysociety/popit,openstate/popit,mysociety/popit,openstate/popit,Sinar/popit,mysociety/popit,openstate/popit,mysociety/popit,mysociety/popit,openstate/popit,Sinar/popit,Sinar/popit,Sinar/popit