Updates on ABNT and Austral Ecology

Update on austral-ecology: sort by author and date in bibliography
Updates on  associacao-brasileira-de-normas-tecnicas:  several udates to format style in accordance to ABNT-NBR 10520.2002 and ABNT-NBR 6023.2002.
I have updated austral-ecology 2 months ago. I think that you see that update. I use git gui and I thought that when I commit changes, it send pull request automatically. 
This pull is to two styles.
Regards,
Mario