Validations on save() should only be run on the server

[mpaulucci]

If the validations are complex and have many 'query' calls, the validations are slow on the client. Doesn't make sense on a performance basis.

If the user needs validations to be run on the client, he can run them manually with validate().

[facundoolano]

Maybe we can add an alternate serverValidations or something like that. I like the possibility of running validations on both sides upon save.