Criadas funções de log para step e option_stack
r_i-2014-04-28_02-23-27-curie.log
r_i-2014-04-28_02-24-19-curie.log
r_i-2014-04-28_02-25-06-curie.log
r_i-2014-04-28_02-25-48-curie.log
r_i-2014-04-28_02-26-24-curie.log