Add per box settings (cf #41)
This PR also:
- fixes model mixins that was not inheriting from
models.Model
, so fields was not active - fixes
form-fullpage.html
template that was overridingtitle
block - introduces a
user.public_fields
method, allowing to loop over user fields, even with a custom user model
If it's better, I can split this into other PRs. :)