User & Customer

[musashimm]

1. There are two variables in code. user and customer. I see no sense to keep as such. If i wrong please tell me. So I will rename customers table to users and do some needed changes.
2. In emap messages the username field should be changed to user_id, which it does User.messages(folder,sort) statemant.

[lmanolov]

I think that it is safe to rename the customers table to users. Initially mailr was part of a bigger system and when we released it as an open source project there were some tables left from the initial design.