Micro library for Brazilian check based on is.js
is.br.rg('911225341');
=> true
is.br.cep('2312301');
=> false
is.br.boleto('3000111.12.92938282');
=> false
is.br.nfe('55012239');
=> false
is.br.carnaval('04/02/2015');
=> true
is.br.pascoa('12/02/2015');
=> false