Add custom attributes and slots to Brands

[glennjacobs]

Developers often want to use brands for different purposes. Introducing custom attributes and slots gives developers the further flexibility they may need.

[alecritson]

Sounds like a good idea, currently we have the name column. Would we still look to keep this or convert it to a name attribute?

[glennjacobs]

We'd keep the name field, like we did with Customers.