makes people and groups implementations consistent, turning profile helpers into a mixin so it can access instance vars rather than being recreated by a factory every time config changes
fixes behavior changes to mixpanel.set_config (shouldn't delete existing entries)
peopleandgroupsimplementations consistent, turning profile helpers into a mixin so it can access instance vars rather than being recreated by a factory every time config changesmixpanel.set_config(shouldn't delete existing entries)