Use WorkbookFactory to create xls or xlsx files

WAY-55
Merge pull request #8 in WAY/way-io from WAY-55-verificar-a-dificuldade-de-ler-.xlsx to master

* commit 'd0c9cc46b513e767b1d8d65dac22b22c9587ca1a':
  Use WorkbookFactory to create xls or xlsx files