Include instance name in confirmation email
Include instance name in confirmation email

Add the slug name to the text of the email as well as including it in
the confirmation URL.

Fixes #455

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