Added unicode to list of permitted types for db_value in AttributeAdmin.
Added unicode to list of permitted types for db_value in AttributeAdmin.

titeuf87/evennia,jamesbeebop/evennia,jamesbeebop/evennia,feend78/evennia,jamesbeebop/evennia,titeuf87/evennia,titeuf87/evennia,feend78/evennia,titeuf87/evennia,feend78/evennia,feend78/evennia