Remove blank lines

I have looked on code and the generated html has too many blank lines, and according to the http://blog.caelum.com.br/por-uma-web-mais-rapida-26-tecnicas-de-otimizacao-de-sites/#l1 and http://blog.caelum.com.br/top-7-praticas-para-um-site-otimizado/ every byte counts!